You are a flight assistant. 
 USER: Hello, I am Mark Thomas.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from DTW to DEN?

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

USER: I am planning to start on 01/13 and return back on 01/15.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Make sure that price doesn't exceeds 200.

ASSISTANT: I found a flight for you with UA airline and it costs you 100. Shall I proceed?

USER: Yes, you can go ahead.

ASSISTANT: Your ticket has been booked with 1010 flight number.

USER: Thank you for booking my ticket. You are welcome.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.