diff --git a/CHANGELOG.md b/CHANGELOG.md
index dac382a..89e9c72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -216,4 +216,7 @@
   - Cancel a run
 # 3.0.2
  - Fix bugs
+## 3.0.3
+ - Fix bugs
+ - Update Demo App
   
\ No newline at end of file
diff --git a/README.md b/README.md
index 4d3fdd7..6723b10 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ supervised and reinforcement learning techniques.
 
 ## Install Package
 ```dart
-chat_gpt_sdk: 3.0.2
+chat_gpt_sdk: 3.0.3
 ```
 
 ## Create OpenAI Instance
diff --git a/lib/src/messages.dart b/lib/src/messages.dart
index a28472c..67a3fc6 100644
--- a/lib/src/messages.dart
+++ b/lib/src/messages.dart
@@ -14,7 +14,7 @@ class Messages {
       : _client = client,
         _headers = headers;
 
-  Future<CreateMessageResponse> createMessage({
+  Future<MessageData> createMessage({
     required String threadId,
     required CreateMessage request,
   }) {
@@ -22,7 +22,7 @@ class Messages {
       _client.apiUrl + kThread + "/$threadId/$kMessages",
       request.toJson(),
       headers: _headers,
-      onSuccess: CreateMessageResponse.fromJson,
+      onSuccess: MessageData.fromJson,
       onCancel: (cancelData) => null,
     );
   }
@@ -34,13 +34,16 @@ class Messages {
     String? after,
     String? before,
   }) {
-    String url = after != null || before != null
-        ? _client.apiUrl +
-            kThread +
-            "/$threadId/$kMessages?limit=$limit&order=$order&after=$after&before=$before"
-        : _client.apiUrl +
-            kThread +
-            "/$threadId/$kMessages?limit=$limit&order=$order";
+    String url = _client.apiUrl +
+        kThread +
+        "/$threadId/$kMessages?limit=$limit&order=$order";
+
+    if (before != null && before.isNotEmpty) {
+      url += '&before=$before';
+    }
+    if (after != null && after.isNotEmpty) {
+      url += '&after=$after';
+    }
 
     return _client.get(
       url,
@@ -64,13 +67,16 @@ class Messages {
     String? after,
     String? before,
   }) {
-    String url = after != null || before != null
-        ? _client.apiUrl +
-            kThread +
-            "/$threadId/$kMessages/$messageId/$kFile?limit=$limit&order=$order&after=$after&before=$before"
-        : _client.apiUrl +
-            kThread +
-            "/$threadId/$kMessages/$messageId/$kFile?limit=$limit&order=$order";
+    String url = _client.apiUrl +
+        kThread +
+        "/$threadId/$kMessages/$messageId/$kFile?limit=$limit&order=$order";
+
+    if (before != null && before.isNotEmpty) {
+      url += '&before=$before';
+    }
+    if (after != null && after.isNotEmpty) {
+      url += '&after=$after';
+    }
 
     return _client.get(
       url,
diff --git a/lib/src/model/message/response/message_data.dart b/lib/src/model/message/response/message_data.dart
index 37e5e3c..f2a8272 100644
--- a/lib/src/model/message/response/message_data.dart
+++ b/lib/src/model/message/response/message_data.dart
@@ -10,6 +10,8 @@ class MessageData {
     required this.id,
     required this.content,
     required this.object,
+    required this.assistantId,
+    required this.runId,
   });
 
   String threadId;
@@ -20,6 +22,8 @@ class MessageData {
   String id;
   List<Content> content;
   String object;
+  String assistantId;
+  String runId;
 
   factory MessageData.fromJson(Map<String, dynamic> json) => MessageData(
         threadId: json["thread_id"] ?? '',
@@ -36,6 +40,8 @@ class MessageData {
                 json["content"].map((x) => Content.fromJson(x)),
               ),
         object: json["object"] ?? '',
+        assistantId: json['assistant_id'] ?? '',
+        runId: json['run_id'] ?? '',
       );
 
   Map<String, dynamic> toJson() => {
@@ -47,5 +53,7 @@ class MessageData {
         "id": id,
         "content": content.map((x) => x.toJson()).toList(),
         "object": object,
+        'assistant_id': assistantId,
+        'run_id': runId,
       };
 }
diff --git a/lib/src/runs.dart b/lib/src/runs.dart
index 4c4abcb..4971de5 100644
--- a/lib/src/runs.dart
+++ b/lib/src/runs.dart
@@ -50,13 +50,16 @@ class Runs {
     String? after,
     String? before,
   }) {
-    String url = after != null || before != null
-        ? _client.apiUrl +
-            kThread +
-            "/$threadId/$kRuns?limit=$limit&order=$order&after=$after&before=$before"
-        : _client.apiUrl +
-            kThread +
-            "/$threadId/$kRuns?limit=$limit&order=$order";
+    String url = _client.apiUrl +
+        kThread +
+        "/$threadId/$kRuns?limit=$limit&order=$order";
+
+    if (before != null && before.isNotEmpty) {
+      url += '&before=$before';
+    }
+    if (after != null && after.isNotEmpty) {
+      url += '&after=$after';
+    }
 
     return _client.get(
       url,
@@ -74,13 +77,16 @@ class Runs {
     String? after,
     String? before,
   }) {
-    String url = after != null || before != null
-        ? _client.apiUrl +
-            kThread +
-            "/$threadId/$kRuns/$runId/steps?limit=$limit&order=$order&after=$after&before=$before"
-        : _client.apiUrl +
-            kThread +
-            "/$threadId/$kRuns/$runId/steps?limit=$limit&order=$order";
+    String url = _client.apiUrl +
+        kThread +
+        "/$threadId/$kRuns/$runId/steps?limit=$limit&order=$order";
+
+    if (before != null && before.isNotEmpty) {
+      url += '&before=$before';
+    }
+    if (after != null && after.isNotEmpty) {
+      url += '&after=$after';
+    }
 
     return _client.get(
       url,
diff --git a/pubspec.yaml b/pubspec.yaml
index 7119001..7fb0755 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: chat_gpt_sdk
 description: create chat bot and other bot with ChatGPT SDK Support GPT-4 , 3.5 and SSE Generate Prompt (Stream)
-version: 3.0.2
+version: 3.0.3
 homepage: https://www.facebook.com/REDEVRX
 repository: https://github.com/redevRx/Flutter-ChatGPT