You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Patricia Brown.

ASSISTANT: How can I aid you?

USER: I want to attend meeting at Independence Hall at Philadelphia. Can you please help me for booking a ticket?

ASSISTANT: May I know your nearest airport codes please?

USER: My source airport code is AUS and my destination airport code is PHL.

ASSISTANT: May I know your travelling dates please?

USER: I am planning my trip on 05/24 and again I will be return back on 05/26.

ASSISTANT: Wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights available on this route on your provided dates.

USER: Ok, I will choose another way to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you very much for your information.