You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kathleen Harris here.

ASSISTANT: How may I aid you?

USER: Can you please help me in booking a flight ticket from HOU to CLT?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: Sure, my travel dates are from Nov 22 to Nov 24.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: Sorry to say, there is no flight found on your route.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for approaching us.