diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..68104c8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# Ignore config.py in the src directory
+src/config.py
\ No newline at end of file
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..9879a85
--- /dev/null
+++ b/main.py
@@ -0,0 +1,133 @@
+from flask import Flask, request, jsonify, Response
+from flask_cors import CORS
+import time
+import json
+from datetime import datetime
+from src.rag import send_chat_message
+
+app = Flask(__name__)
+CORS(app)
+
+# Memory DB
+conversations = {}
+conversation_id_list = []
+new_conversation_id = 0
+
+# GET /conversations/id-list
+@app.route('/conversations/id-list', methods=['GET'])
+def get_id_list():
+    return jsonify({"list": conversation_id_list})
+
+# GET /conversations/{conversation_id}
+@app.route('/conversations/<int:conversation_id>', methods=['GET'])
+def get_conversation(conversation_id):
+    conversation = conversations.get(conversation_id)
+    if conversation:
+        return jsonify(conversation)
+    else:
+        return jsonify({"error": "Conversation not found"}), 404
+
+# POST /conversations
+# @app.route('/conversations', methods=['POST'])
+# def create_conversation():
+#     data = request.get_json()
+
+#     # 요청으로부터 필요 데이터 추출
+#     conversation_id = 0
+#     conversation_id = data.get('data', {}).get('conversation_id', None)
+#     question = data.get('data', {}).get('question', None)
+#     engine = data.get('data', {}).get('engine', None)
+
+#     # error
+#     if (engine is None):
+#         return jsonify({"error": "Engine is not specified"}), 404
+
+#     # 기존 대화가 없으면 새로 생성
+#     if conversation_id is None:
+#         global new_conversation_id
+#         conversation_id = new_conversation_id
+#         new_conversation_id += 1
+#         conversation_id_list.append(conversation_id)
+#         conversations[conversation_id] = {
+#             "title": '${conversation_id}', # 일단 대화 id로 지정
+#             "engine": engine,
+#             "create_time": datetime.now(),
+#             "update_time": datetime.now(),
+#             "pairing": []
+#         }
+#     elif conversation_id not in conversations:
+#         return jsonify({"error": "Conversation not found"}), 404
+
+#     # 답변 생성 및 저장
+#     answer = "세종대왕은 한글을 창제하셨습니다."  # 여기를 우리가 만든 모델에서 받아오게 추후 수정
+#     response_data = {
+#         'data': {
+#             'conversation_id': conversation_id,
+#             'title': conversations[conversation_id]['title'],
+#             'answer': answer
+#         }
+#     }
+
+#     # 요청 메시지와 응답 메시지 저장
+#     conversation_data = {
+#         "id": len(conversations[conversation_id]['pairing']),
+#         "request_message": question,
+#         "response_message": answer,
+#         "create_time": datetime.now()
+#     }
+#     conversations[conversation_id]['pairing'].append(conversation_data)
+
+#     return jsonify(response_data)
+
+@app.route('/conversations', methods=['POST'])
+def mvp_create_conversation():
+    data = request.get_json()
+
+    # 요청으로부터 필요 데이터 추출
+    conversation_id = data.get('data', {}).get('conversation_id', 0)
+    question = data.get('data', {}).get('question', None)
+    engine = data.get('data', {}).get('engine', None)
+
+    # error
+    if (engine is None):
+        return jsonify({"error": "Engine is not specified"}), 404
+
+    # 기존 대화가 없으면 새로 생성
+    if conversation_id is None:
+        global new_conversation_id
+        conversation_id = new_conversation_id
+        new_conversation_id += 1
+        conversation_id_list.append(conversation_id)
+        conversations[conversation_id] = {
+            "title": '${conversation_id}', # 일단 대화 id로 지정
+            "engine": engine,
+            "create_time": datetime.now(),
+            "update_time": datetime.now(),
+            "pairing": []
+        }
+    elif conversation_id not in conversations:
+        return jsonify({"error": "Conversation not found"}), 404
+
+    # 답변 생성 및 저장
+    answer = send_chat_message(question)  # 여기를 우리가 만든 모델에서 받아오게 추후 수정
+    response_data = {
+        'data': {
+            'conversation_id': conversation_id,
+            'title': "",
+            'answer': answer
+        }
+    }
+
+    # 요청 메시지와 응답 메시지 저장
+    conversation_data = {
+        "id": len(conversations[conversation_id]['pairing']),
+        "request_message": question,
+        "response_message": answer,
+        "create_time": datetime.now()
+    }
+    conversations[conversation_id]['pairing'].append(conversation_data)
+
+    return jsonify(response_data)
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..c4edea7
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,8 @@
+requests
+google-auth
+google-auth-oauthlib
+google-cloud-aiplatform
+langchain
+flask
+flask-cors
+langchain_google_vertexai
\ No newline at end of file
diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/rag.py b/src/rag.py
new file mode 100644
index 0000000..88f5c9b
--- /dev/null
+++ b/src/rag.py
@@ -0,0 +1,82 @@
+import requests
+# from vertexai.generative_models import (
+#     FunctionDeclaration,
+#     GenerationConfig,
+#     GenerativeModel,
+#     Part,
+#     Tool,
+# )
+from .vertex_ai_search import search_pdf
+
+# def tool_declarate() -> Tool:
+#     # 항공 운임표 정보를 조회하는 기능
+#     get_flight_fare_info = FunctionDeclaration(
+#         name="get_flight_fare_info",
+#         description="Retrieve flight fare information from a PDF based on departure and destination",
+#         parameters={
+#             "type": "object",
+#             "properties": {
+#                 "departure": {"type": "string", "description": "Departure city"},
+#                 "destination": {"type": "string", "description": "Destination city"},
+#             },
+#             "required": ["departure", "destination"]
+#         },
+#     )
+
+
+#     # 여객 운송 약관(탑승 수속, 수하물 규정 등)을 조회하는 기능
+#     get_transport_policy_info = FunctionDeclaration(
+#         name="get_transport_policy_info",
+#         description="Retrieve transportation policy information such as check-in and baggage rules from a PDF",
+#         parameters={
+#             "type": "object",
+#             "properties": {
+#                 "policy_type": {"type": "string", "description": "Type of policy, e.g., check-in, baggage rules"},
+#             },
+#             "required": ["policy_type"]
+#         },
+#     )
+
+#     # # 항공편 정보 조회하는 기능
+#     # get_flight_info = FunctionDeclaration(
+#     #     name="get_transport_policy_info",
+#     # )
+    
+#     flight_tool = Tool(
+#         function_declarations=[
+#             get_flight_fare_info,
+#             get_transport_policy_info,
+#             # get_flight_info,
+#         ],
+#     )
+#     return flight_tool
+    
+def send_chat_message(prompt:str) -> str:
+    # tools=[tool_declarate()]
+    
+    # model = GenerativeModel(
+    #     "gemini-1.5-pro-001",
+    #     generation_config=GenerationConfig(temperature=0),
+    #     tools=tools,
+    # )
+    # chat = model.start_chat()
+    
+    # print("prompt: " + prompt + "\n")
+    # prompt += """
+    # Give a concise, high-level summary. Only use information that you learn from
+    # the API responses.
+    # """
+
+    # # Gemini로 채팅 메시지 보내기
+    # response = chat.send_message(prompt)
+
+    # # 함수 호출의 응답에서 값 추출
+    # function_call = response.candidates[0].content.parts[0].function_call
+
+    # # Gemini가 판단하여 호출한 함수
+    # selected_function_name = function_call.name
+    # print("selected_function_name: " + selected_function_name, "\n")
+    answer_response = search_pdf(prompt)
+    return answer_response
+    
+    
\ No newline at end of file
diff --git a/src/vertex_ai_search.py b/src/vertex_ai_search.py
new file mode 100644
index 0000000..564b6b1
--- /dev/null
+++ b/src/vertex_ai_search.py
@@ -0,0 +1,147 @@
+import vertexai
+import google
+import google.oauth2.credentials
+from google.auth import compute_engine
+import google.auth.transport.requests
+import requests
+import json
+import os
+from langchain_google_vertexai.llms import VertexAI
+from langchain.prompts import PromptTemplate
+from langchain.chains import LLMChain
+#from .config import PROJECT_ID, REGION, MODEL, SEARCH_URL
+PROJECT_ID = ""
+REGION="asia-northeast3"
+MODEL = "gemini-1.5-pro-001"
+SEARCH_URL = ""
+
+import google.auth
+import google.auth.transport.requests
+creds, project = google.auth.default()
+auth_req = google.auth.transport.requests.Request()
+creds.refresh(auth_req)
+id_token = creds.token
+
+
+def retrieve_vertex_ai_search(question:str, search_url:str, page_size:int) -> str:
+    # stream = os.popen('gcloud auth print-access-token')
+    # credential_token = stream.read().strip()
+    
+    """ retrieve information from enterprise search ( discovery engine )"""
+
+    # Create a credentials token to call a REST API
+    headers = {
+        "Authorization": "Bearer "+ id_token,
+        "Content-Type": "application/json"
+    }
+
+
+    query_dic ={
+        "query": question,
+        "page_size": str(page_size),
+        "offset": 0,
+        "contentSearchSpec":{
+            # "snippetSpec": {"maxSnippetCount": 5,
+            #                 },
+            # "summarySpec": { "summaryResultCount": 5,
+            #                  "includeCitations": True},
+            "extractiveContentSpec":{
+                #"maxExtractiveAnswerCount": 3,
+                "maxExtractiveSegmentCount": 2,
+                "num_previous_segments" : 1,
+                "num_next_segments" : 1,
+                "return_extractive_segment_score" : True
+              }
+        },
+        # "queryExpansionSpec":{"condition":"AUTO"}
+    }
+
+    data = json.dumps(query_dic)
+
+    # Encode data as UTF8
+    data=data.encode("utf8")
+
+    response = requests.post(search_url,headers=headers, data=data)
+
+    print(response.text)
+    return response.text
+
+def parse_discovery_results(response_text: str) -> dict:
+    """Parse response to build a context to be sent to LLM."""
+
+    # JSON 문자열을 파이썬 객체로 변환
+    dict_results = json.loads(response_text)
+
+    result_index = 0
+    searched_ctx_dic = {}
+
+    # 결과가 있는지 확인
+    if dict_results.get('results'):
+        for result in dict_results['results']:
+            answer_ctx = ""  # 답변 내용을 저장할 변수
+            segments_ctx = ""  # 세그먼트 내용을 저장할 변수
+
+            # 문서 링크 가져오기
+            reference = result['document']['derivedStructData']['link']
+            derivedStructData = result['document']['derivedStructData']
+
+            # 'extractive_answers'가 존재하는지 확인하고, 답변을 추출
+            if 'extractive_answers' in derivedStructData and derivedStructData['extractive_answers']:
+                for answer in derivedStructData['extractive_answers']:
+                    answer_ctx += answer.get('content', '')  # 안전하게 내용 추가
+
+            # 'extractive_segments'가 존재하는지 확인하고, 세그먼트를 추출
+            if 'extractive_segments' in derivedStructData and derivedStructData['extractive_segments']:
+                for segment in derivedStructData['extractive_segments']:
+                    segments_ctx += segment.get('content', '')  # 안전하게 내용 추가
+
+            # HTML 태그 및 인코딩 제거
+            answer_ctx = answer_ctx.replace("<b>", "").replace("</b>", "").replace("&quot;", "")
+            segments_ctx = segments_ctx.replace("<b>", "").replace("</b>", "").replace("&quot;", "")
+
+            # Google Cloud Storage 링크로 변환
+            reference_link = reference.replace("gs://", "https://storage.cloud.google.com/")
+
+            # 결과를 딕셔너리에 저장
+            item = {
+                'answer_ctx': answer_ctx,
+                'segments_ctx': segments_ctx,
+                'reference_link': reference_link
+            }
+
+            searched_ctx_dic[f"Searched Context {result_index}"] = item
+            result_index += 1
+
+    return searched_ctx_dic
+
+def search_pdf(question:str, SEARCH_URL:str = SEARCH_URL) -> str:
+    gemini_pro = VertexAI( model_name = MODEL,
+                  project=PROJECT_ID,
+                  location=REGION,
+                  verbose=True,
+                  streaming=False,
+                  temperature = 0.2,
+                  top_p = 1,
+                  top_k = 40
+                 )
+    
+    page_size = 5
+    
+    searched_ctx = retrieve_vertex_ai_search(question, SEARCH_URL, page_size)
+    context = parse_discovery_results(searched_ctx)
+
+    prompt = PromptTemplate.from_template("""
+
+    당신은 항공사 CS AI 어시스턴트입니다.
+    아래 Question 에 대해서 반드시 Context에 있는 개별 내용을 기반으로 단계적으로 추론해서 근거를 설명하고 답변해주세요.
+    Context : {context}
+    Question : {question}
+
+    """)
+
+    prompt = prompt.format(context=context, question=question)
+
+    print(f"Prompt : {prompt}")
+
+    response = gemini_pro.invoke(prompt)
+    return response
\ No newline at end of file