You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need your help to book a flight from AUS to OAK.

ASSISTANT: Can I know your travelling dates?

USER: Sure, I want to travel on May 21 and need to return on May 23.

ASSISTANT: Do you need any connection limit?

USER: No, I need a direct fight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Janet Nelson.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.