You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Lee.

ASSISTANT: How may I serve you at this moment?

USER: I am planning to book a ticket from AUS to DCA. Can you please help me out?

ASSISTANT: Sure, may I know your travelling dates please?

USER: I would like to travel on 04/30 and return back on 05/02.

ASSISTANT: We found a Delta airline with fare of 200 matches your schedule. Shall I proceed with booking?

USER: That's fine, please proceed the booking.

ASSISTANT: Your ticket has been confirmed with flight number 1027.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.