You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book the flight ticket from AUS to PHL. Can you please help me?

ASSISTANT: Sure, can you mention your travel dates please?

USER: My travel dates are May 10 and May 12.

ASSISTANT: Do you need a flag stop in between your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Helen Jones.

ASSISTANT: Do you have any other specifications to be met?

USER:  I don't have any other preferences?

ASSISTANT: Sorry, there are no flights available on your required routes.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.