You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,how can I help you?

USER: Can you book a flight ticket to Denver to visit Denver Center for the performing Arts.

ASSISTANT: Sure,may I know your travelling dates?

USER: Can you please book me flight ticket with in fare of 200?

ASSISTANT: Sure.

USER: My travelling dates are departure on 01/15 and return on 01/17.

ASSISTANT: May I know your airport codes?

USER: DC - DCA to CO - DEN are my airport codes.

ASSISTANT: May I know your name?

USER: Elizabeth Smith is my name.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is a southwest 1009 airline which matches your requirements. Shall I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your booking is done with a price of 100.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you for approaching us.