You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from SEA to SFO. Could you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Travel dates are Sept, 30 and Oct, 2.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer connecting flight.

ASSISTANT: May I know your good name please?

USER: I am Catherine King.

ASSISTANT: Do you have any class preference?

USER: I would like to prefer business class.

ASSISTANT: Sorry, there is no flight available for your request.

USER: Thank you.

ASSISTANT: You are welcome.