You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I need to book a flight ticket from AUS to PHL, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I would like to travel on 09/07 to return on 09/09.

ASSISTANT: Do you have any class preference for this trip?

USER: I am comfortable with any class.

ASSISTANT: May I know your connection limit preference for this trip?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: I would be depart on afternoon.

ASSISTANT: Can you please provide your name for documentation purpose?

USER: Andrew Hall.

ASSISTANT: Andrew Hall, we regret to inform you that there are no flight services are available on this route with your preferences.

USER: ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.