You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Gregory Lopez. I am planning to book a ticket from HOU. Can you please help me out to book a ticket?

ASSISTANT: Sure, could you please share your price limit?

USER: My price limit is 200.

ASSISTANT: May I know your destination airport code?

USER: My destination airport code is JFK.

ASSISTANT: Sure, could you please share your journey dates?

USER: I would like to travel on 07/15 and return back on 07/17.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's fine.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your help.