You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to attend a live concert at Denver, Can you help me to book a flight ticket within the fare limit 1000?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My journey dates are 12/17 and 12/19.

ASSISTANT: May I now your origin airport code and destination airport code please?

USER: My airport codes are LAX-DEN.

ASSISTANT: May I know your name please to proceed further.

USER: I am William Clark.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: William Clark, there are no flights available in your route.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for approaching us.