update prompt

app.py

@@ -1007,7 +1007,7 @@ $JSON_BLOB with the value of the following 2 keys:
     "action": **Valid value** must be one of [{tool_names}]
     "action_input": The input for the action
 If **Thought**, **Action** is missing in the response of using tools, you must re-write the response.
----\n When you are able to provide final answer, you must use the following format to output "Thought", "Action" (json blob):
+---\n When you are able to provide final answer, you must use the following format to output "Thought", "Action" (json blob):\n
 '''
 Thought: I know what to respond
 Action: