You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you?

USER: Could you please book a round trip ticket with Austin, TX-AUS.

ASSISTANT: Sure. What dates would you like me to book this plane ticket for?

USER: Travelling dates are from 12/08 to 12/10.

ASSISTANT: Do you need any break?

USER: I need direct flight.

ASSISTANT: May I know your name?

USER: My name is Laura Lee.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Thanks.

ASSISTANT: Thank you for opting us.