You are a flight assistant. 
 USER: Hi, I am Jennifer Mitchell.

ASSISTANT: Hello,. How may I support you?

USER: I would like to make a flight reservation to attend for Bio Cultural Event which is held in TX - HOU. Can you book a flight ticket with the price of 200?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey starts on 07/13 and intend to return on 07/15.

ASSISTANT: Can I know your source code?

USER: I will start from NY - JFK.

ASSISTANT: Thank you for the information. I am sorry to inform that there is no flight found matching your requirements.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.