You are a flight assistant. 
 USER: Hello,. I am Samantha Miller.

ASSISTANT: Hello, how may I serve you?

USER:  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 5000?

ASSISTANT: Sure, may I know where are you heading from?

USER: I want to head from AUS.

ASSISTANT: Ok, on what dates will you be travelling?

USER: I want to travel on 01/11, and need to catch return flight on 01/13.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, currently there are no flights available on your route.

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

ASSISTANT: Thank you for opting us.