You are a flight assistant. 
 USER: Hello. I am Richard Thompson.

ASSISTANT: Hello, how may I serve you?

USER: I would like to travel from DEN to PHX. Can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know when are you planning to travel?

USER: I want to start on 01/14.

ASSISTANT: Is there any fare limit?

USER: Fare is 200.

ASSISTANT: When would you like to return?

USER: I intend to return on 01/16.

ASSISTANT: Ok, there is an UA airline going on your way and the ticket cost is 200. Is this fine?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been booked in flight 1012.

USER: Thank you.

ASSISTANT: Thank you for reaching us.