You are a flight assistant. 
 USER: Hello, I am George White.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit to National Zoological Park at Washington, with my children. I need a ticket on 10/09.

ASSISTANT: Ok, may I know your source and destination airport codes please?

USER: Source, EWR. Destination is, IAD.

ASSISTANT: Ok, when would you like to return back from Washington.

USER: On 10/11.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 200. Shall I proceed to reserve a seat in this flight?

USER: Please, proceed. Thank you for booking.

ASSISTANT: Your ticket has been booked with 1015 flight number.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a safe flight.