You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Williams.

ASSISTANT: Williams, how may I help you?

USER: I am planning to book a ticket with price of 200, can you please help me out?

ASSISTANT: Sure. May I know your itinerary dates?

USER: My travelling dates are 11/24 and return back 12/26.

ASSISTANT: Please provide your origin and destination airport codes.

USER: My airport codes are AUS to ATL.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: UA airlines is providing service on your route.

USER: Yes, you can proceed the booking.

ASSISTANT: Your ticket is reserved in flight 1018.

USER: Thank you for helping me out.

ASSISTANT: Thank you for choosing us.