You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: Please help me in booking a flight ticket in business class to reach OAK.

ASSISTANT: Sure, I can help you better.

USER: Ok.

ASSISTANT: May I know your travel dates which you have planned?

USER: I will start on Dec 8th and I intend to return on Dec 10th.

ASSISTANT: Please mention your origin airport code.

USER: My origin airport code is LAX.

ASSISTANT: Ok, if you have any concerns please mention here.

USER: Make sure that I want to return in evening flight.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, currently no flights are running on your route.

USER: Ok, not a problem. Thank you for quick response.

ASSISTANT: May I know your name for documentation process?

USER: I am Ruth Nelson.

ASSISTANT: Thanks for approaching us, have a nice day.