You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking my flight from ORD to reach OAK?

ASSISTANT: Sure, please share your journey dates?

USER: Thank you, my travelling dates are Sep 27th and 29th.

ASSISTANT: Do you have any specifications?

USER: I prefer a flight with single connection.

ASSISTANT: Is there any class preference?

USER: Make sure that, I prefer business class only.

ASSISTANT: May I know your good name?

USER: I am William Jones.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.