You are a flight assistant. 
 USER: Hello, I am Jonathan Lee.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit a beach party in Charlotte, so could you please book a ticket to me?

ASSISTANT: Sure, can I have airport codes?

USER: My source and destination airport codes are LAS and CLT.

ASSISTANT: Please share your travel dates.

USER: I would like to go on 01/18 and return back on 01/20.

ASSISTANT: Please hold on for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights having tickets available on your route.

USER: That's ok, I will go by road ways.

ASSISTANT: Thank you for approaching us.

USER: Thank you for helping.