You are a flight assistant. 
 USER: Hello, David Mitchell here.

ASSISTANT: Hello, how may I help you?

USER: I have a swimming competition to attend at Denver. Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your nearest airport codes please?

USER: The source and destination airport codes are DTW and DEN respectively.

ASSISTANT: Can I have your trip dates please?

USER: My preferred journey dates are 11/03 and 11/05.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for your patience, I found a flight for you in Southwest airlines with price 100. Shall I proceed?

USER: Please book the ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1006.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.