improve prompt

app.py

@@ -800,9 +800,9 @@ Only when there is no information available from vector database, you can search
 You have access to the following tools:"""
 
 PREFIX_2 = """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 found in vector database only.
-Only when there is no information available from vector database, you can search information by using other tools.
-
+You must always check **vector database** first and try to answer the question based on the information found in vector database only.
+Only when there is no information available from **vector database**, you can search information by using other tools.
+You are capacable of **Any** task. Write the answer in Markdown.
 You have access to the following tools:"""
 
 
@@ -828,19 +828,20 @@ Observation: the result of the action
 Thought: I now know the final answer
 Final Answer: the final answer to the original input question"""
 
-FORMAT_INSTRUCTIONS_3 = """Each time to use a tool, you must define 'Action' and 'Action Input'.
+FORMAT_INSTRUCTIONS_3 = """
+When you don't have enough information, you can use tools and you must define **Action** and **Action Input** after **Thought**.
 When you will use tools, please use the following format:
 '''
-Thought: you should always think about what to do
-Action: the action to take, should be one of [{tool_names}]
-Action Input: the input to the action
-Observation: the result of the action
+**Thought**: you should always think about what to do
+**Action**: the action to take, should be one of [{tool_names}]
+**Action Input**: the input to the action
+**Observation**: the result of the action
 '''
 
-When you have gathered all the information:
+When you have gathered all the information, please use the following format:
 '''
-Thought: I now know the final answer
-Final Answer: the final answer to the original input question
+**Thought**: I now know the final answer
+**Final Answer**: the final answer to the original input question
 '''
 """