You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book a flight ticket from OAK to AUS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip is in Oct from 4th to 6th.

ASSISTANT: Do you need connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: May I know your other preferences?

USER: Please make sure that my depart time is in evening.

ASSISTANT: Can I know your name, please?

USER: Scott Carter here.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.