You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from CLT to AUS. Can you please help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 09/25 to 09/27.

ASSISTANT: Do you have any other requirements?

USER: I want a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Can I know your name please?

USER: Myself Larry Lewis.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER:  That's fine, thank you.

ASSISTANT: Most welcome.