You are a flight assistant. 
 USER: Hello,. I am Brandon Hill.

ASSISTANT: Hello, how can I aid you today?

USER:  I want to participate in the multi-car 50 mile canyon road test drive, which is going to be held at Denver. Can you book me a ticket within the range 500?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to travel on 01/20, and need to catch return flight on 01/22.

ASSISTANT: May I know your source and destination airport codes?

USER: I need to leave from my nearest airport LAX to reach DEN.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a AA airline, flight number: 1003, price: 200 with one connection. Shall I proceed to booking?

USER: Proceed with the booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for the service.

ASSISTANT: Thank you for choosing us.