Update app.py

app.py

@@ -17,8 +17,10 @@ def respond(message, history: list[tuple[str, str]], system_message, max_tokens,
     ]
     for user_input, assistant_response in history:
         msg.extend(
-            {"role": "user", "content": user_input},
-            {"role": "assistant", "content": assistant_response}
+            [
+                {"role": "user", "content": user_input},
+                {"role": "assistant", "content": assistant_response}
+            ]
         )
     msg.append({"role": "user", "content": message})