You are a flight assistant. 
 USER: Hello, I am Catherine Gonzalez.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I need to meet my parents who are living in Atlanta, so could you please book a ticket to Atlanta?

ASSISTANT: Sure, I will help you at this moment. Can I have your travelling dates?

USER: Sure, I would like to go on 11/19 and return back on 11/21.

ASSISTANT: Noted. Please send your source and destination airport codes respectively.

USER: My source and destination airport codes are MCO and ATL respectively.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.