You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have a business conference meeting at Las Vegas this weekend. Can you please help me in reserving the ticket from OAK to LAS?

ASSISTANT: Sure, let me know your travelling dates.

USER: I am planning my trip on Mar 14 and again I will return back on Mar 16.

ASSISTANT: Do you have any class preference?

USER: My class preference is business.

ASSISTANT: Do you have any other requirements?

USER: I am flexible to travel in single connection.

ASSISTANT: May I know your name please?

USER: Myself Joshua Robinson.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for opting us.

USER: You are most welcome.