You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from SEA to EWR, can you help me?

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

USER: My travel dates are June 08 and 10.

ASSISTANT: Do you have any class preference?

USER: I prefer business class.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your good name please?

USER: I am Jack Johnson.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.