You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to visit Philadelphia, will you help me in booking the flight ticket from AUS to PHL?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My preferable journey dates are Feb 20 and Feb 22.

ASSISTANT: Do you need break in between your journey?

USER: I need a direct flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I prefer to travel in economy class which departs in morning time.

ASSISTANT: May I know your good name please?

USER: Myself Paul Hill.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, not a issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.