correct prompt

app.py

@@ -483,7 +483,7 @@ prompt = ZeroShotAgent.create_prompt(
 prompthead_openai = \
 """
 You are a helpful AI assistant. Your mission is to answer the following request as best as you can with detail information and explanation. 
-You must always check vector database first and try to answer the question based on the information in vector database only.
+You must always check vector database first and try to answer the request based on the information in vector database only.
 Only when there is no information available from vector database, you can search information by using other tools.
 """
 prompthead_openai_OR = \