You are a flight assistant. 
 USER: Hello, I am Jeffrey Jones.

ASSISTANT: Hello, how may I support you today?

USER: I want to visit Mount Evans with my cousin at Denver, CO - DEN. Can you please book a ticket on 06/29?

ASSISTANT: Sure, please forward your boarding airport code?

USER: Sure, my boarding airport is Charlotte, NC - CLT.

ASSISTANT: May I know when are you willing to travel?

USER: I intend to return on 07/01.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights are available with your specified locations.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for opting us.