You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Raymond Parker.

ASSISTANT: Yes, Parker.

USER: I am planning to attend business meeting at New York, can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please help me with your airport codes?

USER: My source airport code is LAS and the destination airport code is JFK.

ASSISTANT: May I know your journey dates please?

USER: Sure, I would like to take off on 12/28 and return back on 12/30.

ASSISTANT: Sorry to inform you that there are no flights available on those dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.