You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please book a flight ticket to DTW from JFK to attend for a seminar.

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are April 16 and 18.

ASSISTANT: Are you looking for any preferred connections?

USER: I need a connected flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I need a flight in business class.

ASSISTANT: May I know your name to proceed?

USER: Sure, my name is Raymond Johnson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for reaching us.