You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is George Hall. I would like to travel from ATL to IAH, could you help me out?

ASSISTANT: May I know your trip dates?

USER: My preferable dates are from 09/19 to 09/21.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Most welcome.