You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight ticket from DFW to AUS?

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, my travel dates are from Aug 24 to Aug 26.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I would prefer connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Myself Steven Collins.

ASSISTANT: May I know your class preferences?

USER: I don't have class preference.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.