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

ASSISTANT: Hello, how may I aid you?

USER: I would like to attend my Client Meeting in Charlotte, NC - CLT. Can you book a flight ticket from Las Vegas, NV - LAS?

ASSISTANT: Sure, may I know your journey dates?

USER: My travel dates are from 01/13 to 01/15.

ASSISTANT: Sorry, there are no flights currently available to your roue.

USER: Thanks for your kind information.

ASSISTANT: Thank you for reaching us.