You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Katherine Anderson.

ASSISTANT: Ok.

USER: I am planning to visit Charlotte, will you help me in booking the flight ticket from DTW to CLT?

ASSISTANT: Sure, can you please share your travelling dates?

USER: My preferable journey dates are Nov 19 and 21.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you have any class preference?

USER: I always prefer business class.

ASSISTANT: Ok, any other requirements to be met?

USER: Make sure that my depart time is evening.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.