You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need a direct flight, could you please help me with booking a flight ticket?

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are Dec 17 and Dec 19.

ASSISTANT: Will you please share your airport codes?

USER: My airport codes are OAK and CLT.

ASSISTANT: May I know your name?

USER: I am Brian Turner.

ASSISTANT: Any other requirements?

USER: Yes, I need a business class.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights going on your way at this moment.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us.