You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you for the day?

USER: I am Brandon Martinez. I want to participate in the multi-car 50 mile canyon road test drive, which is going to be held at Denver, DEN. Can you book me a ticket within the range 1000?

ASSISTANT: Sure, we can help you.

USER: Thank you.

ASSISTANT: Can you please help me with providing your take off airport code?

USER: I want to take off from DCA.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I want to travel on 02/12, and need to catch return flight on 02/14.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your journey dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for availing us.