You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Williams Phillips, I want to book a Denver to attend meeting with share holders. Can you book a flight under fare of 500?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I will travel on 02/02 and return on 02/04.

ASSISTANT: Please share me your airport codes.

USER: My source point is DC-DCA and destination is CO-DEN.

ASSISTANT: We found a AA airline, flight number:1007 and the price is 100. Can I reserve it?

USER: Sure.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for opting us.