Update app.py

app.py

@@ -118,7 +118,10 @@ def chat(user_message: str, history: list, thread_id: str, current_phase: int):
         return history, build_progress_bar(current_phase), current_phase, ""
 
     response = invoke_agent(user_message, thread_id=thread_id)
-    history = history + [(user_message, response)]
+    history = history + [
+    {"role": "user", "content": user_message},
+    {"role": "assistant", "content": response},
+]
 
     new_phase = max(current_phase, detect_phase(response))
     return history, build_progress_bar(new_phase), new_phase, ""
@@ -305,7 +308,7 @@ def build_ui():
             chatbot = gr.Chatbot(
                 elem_id="chatbot",
                 height=440,
-                
+                value=[],
                 avatar_images=(
                     None,
                     "https://api.dicebear.com/7.x/bottts/svg?seed=bertopic&backgroundColor=4f46e5",