You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me in booking a flight ticket from OAK to LAS?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Sure, I would like to go on Oct 16th and return back on Oct 18th.

ASSISTANT: Ok, please share me your name.

USER: Myself Mark Brown.

ASSISTANT: Ok, do you have any specifications?

USER: Make sure the class is business.

ASSISTANT: Sory, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.