You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I'm Gary Jones. I am planning to attend music concert at Denver, can you please help me with booking a flight ticket?

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

USER: Sure, I would like to take off on 07/29 and return back on 07/31.

ASSISTANT: Can you please let me know your airport codes?

USER: My source airport code is IAD and the destination airport code is DEN.

ASSISTANT: Gary, there is a flight with UA airlines available with price 100. Shall I book the ticket for you?

USER: Yes, please proceed with the booking.

ASSISTANT: Your ticket is confirmed and the flight number is 1017.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are welcome.