You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket can you help me?

ASSISTANT: Yes, may I know your name so that I can proceed further?

USER: My name is Patricia Lee.

ASSISTANT: OK Patricia, please provide the airport codes along with travelling dates?

USER: I want to travel from TX - AUS to TX - DFW. My travel dates are 09/22 & 09/24.

ASSISTANT: OK, please give me a second so that I can check whether the flight is available or not on your requested dates.

USER: OK.

ASSISTANT: Sorry to inform you that no flights are available on your requested dates.

USER: OK. Thank you for checking.

ASSISTANT: Have a nice day.