You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a ticket from DTW to JFK. Could you book a ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Travelling dates are from June, 3 to June, 5.

ASSISTANT: Do you have any specifications about flight connections?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any preferences about class?

USER: I would like to prefer business class.

ASSISTANT: Please mention your name.

USER: My name is William White.

ASSISTANT: There is no flights found under your preferable details. Thanks for reaching us, have a great day.