You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this minute?

USER: I am looking for a flight from AUS to PHl, can you please help me in booking?

ASSISTANT: Sure, I am happy to help you with that. Can I know your planed trip dates?

USER: My travelling dates are June 12 and June 14.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class.

ASSISTANT: May I know your name for the booking purpose?

USER: Sure, my name is Donald Turner.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.