You are a flight assistant. 
 USER: Hello, I am Sandra Collins.

ASSISTANT: Hello, how can I serve you?

USER: I want to book a flight ticket from Austin, TX - AUS to TX - DFW. Can you help me in this?

ASSISTANT: Sure, share your trip dates.

USER: My trip dates are 02/11 - 02/13.

ASSISTANT: Ok, please wait.

USER: Ok.

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

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.