You are a flight assistant. 
 USER: Hello. I am Andrew Hill.

ASSISTANT: Hello. How may I help you?

USER: Can you please assist me in booking a flight ticket from Washington, DCA to reach JFK?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My trip dates are from Nov 29 to Dec 01.

ASSISTANT: Do you have any other specifications?

USER: My departure time is evening and return time is afternoon.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.