You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brian Martin.

ASSISTANT: Martin, how can I aid you today?

USER: I would like to travel from AUS to DTW for a urgent meeting, could you help me out?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would like to depart on Feb 22 and return back on Feb 24.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.