You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Ok, please can you help me to book a flight ticket from OAK to AUS?

ASSISTANT: Sure, please share me your trip dates.

USER: Ok, please book for the dates Mar 14th and Mar 16th respectively.

ASSISTANT: For booking we need your name, please provide it.

USER: Please book on the name Dennis Young.

ASSISTANT: May I know your class preference?

USER: No, I don't have any class preference.

ASSISTANT: Is there any connection limit for you?

USER: Yes, I need a direct flight.

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

USER: Yes, I need a departure flight during afternoon.

ASSISTANT: Please wait for a while.

USER: Ok, please take the time you need.

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

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for availing us.