You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Turner.

ASSISTANT: How shall I amend you at this moment?

USER: I would like to attend a meeting with my shareholders for business development in Rockefeller Center at New York, JFK.

ASSISTANT:       Fine.

USER: Can you please book me a flight ticket from DCA?

ASSISTANT: For booking a ticket, I have to know your source point. Ok. I  need your scheduled dates of journey.

USER: I will catch my flight on 12/17 and return back on 12/19.

ASSISTANT: Sorry, there were no flights available for you.

USER: No issue, thank you.

ASSISTANT: Thank you for consulting us.