You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Jack Thomas here. Can you please book a direct flight from my journey Charlotte to Las Vegas?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, I would like to travel on 10/09 and return back on 10/11.

ASSISTANT: Can you please share your source and destination airport codes?

USER: Ok, my source and destination codes are CLT and LAS.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for checking out.