improve logic

app.py

@@ -89,7 +89,7 @@ async def ppt_content(data):
 
     for x in listOfString:
         result = agent.run_sync(user_prompt = f"Create me a powerpoint presentation {x}",message_history = message_history,deps=deps)
-        message_history = []
+        message_history.pop()
         message_history = result.all_messages()
         result_data.append(result.data)
     print(result_data[-1])