You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you book a business class ticket from OAK to ORD to attend my friend's birthday function?

ASSISTANT: Sure, I can do that for you. May I know your name?

USER: My name is Ronald Hall.

ASSISTANT: Thank you for providing us your name. Please help us with your travel dates.

USER: My travel dates are June, 8 and June, 10.

ASSISTANT: Sure, do you have any class preference?

USER: I already mentioned above.

ASSISTANT: Ok, may I know your airlines preference?

USER: I am happy with any airlines.

ASSISTANT: I am sorry to inform you, there is no flight available as per your requirements.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.