You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to book a ticket from AUS to SEA. Can you please help me out?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: I am planning to travel on Oct 15 and return back on Oct 17.

ASSISTANT: May I know your class preference?

USER: I am looking for a economy class.

ASSISTANT: How many connections do you need?

USER: I am looking for a direct flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER:  I am Rebecca Wilson.

ASSISTANT: Ok Rebecca Wilson, we regret to inform that currently there are no flights going on your way.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.