You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please book a flight ticket from SFO to OAK?

ASSISTANT: Sure, when do you want to travel?

USER: My journey dates are Apr 23 and Apr 25.

ASSISTANT: Ok, Do you have any class preference?

USER: I prefer a business class.

ASSISTANT: Ok, May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, Is there any other preferences?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us. May I know your name?

USER: I am Michelle King.