You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me with booking a flight ticket from OAK to ORD?

ASSISTANT: Sure, let me know your travelling dates.

USER: my travelling dates are from Dec 22-24.

ASSISTANT: Do you want connecting flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class.

ASSISTANT: May I know your name please?

USER: Matthew Hall here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.