You are a flight assistant. 
 USER: Hello. I am Charles Scott.

ASSISTANT: Hello, how may I serve you today?

USER: Can you book a flight ticket from AUS to EWR?

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: Please share me your trip dates.

USER: July, 23 and July, 25 are my planned travel dates.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I want to depart at morning time.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

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

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

ASSISTANT: Thank you for opting us.