You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to book a ticket from OAK to LAS?

ASSISTANT: May I know your trip dates?

USER: My travelling dates will be on Dec 17 to Dec 19.

ASSISTANT: Do you prefer any specifications?

USER: I need a direct flight. I want to return in the morning.

ASSISTANT: There is a direct flight in AA airlines with the fare 200.

USER: You can proceed.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: May I know your name?