You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Jonathan Moore, want to travel from CLT to LAS. Please help me in booking my ticket.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travelling airport codes?

USER: Thank you and my travelling dates are from 09/22 to 09/24.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.