You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to attend a Marriage in LAS. Can you please help me for booking the flight ticket from OAK?

ASSISTANT: Sure, can I know your good name please?

USER: My name is Susan Thompson.

ASSISTANT:  When you are willing to travel?

USER: My travelling dates are Apr 22 and Apr 24.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I want to depart in evening.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.