You are a flight assistant. 
 USER: Hello, I am Cynthia Lee.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to meet my friends at Philadelphia. Can you book a ticket from HOU to PHL?

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

USER: I am willing to start on 09/04 and return back on 09/16.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: I found a flight for you with Delta airline and it costs you 200.

USER: Please book it.

ASSISTANT: Shall I proceed?

USER: Thank you for booking my ticket.

ASSISTANT: Your ticket has been booked with 1005 flight number. Thank you for reaching us.

USER: Welcome.