You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket from Detroit to attend a wedding, can you please book a business class ticket?

ASSISTANT: Sure, I will help you. May I know your origin and destination airport codes please?

USER: My airport codes are DTW and CLT.

ASSISTANT: Can you please share your planned journey dates?

USER: Yes, my trip dates are June 21 and June 23.

ASSISTANT: May I know your name please to proceed further?

USER: My name is Angela Allen.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a connecting flight.

ASSISTANT: May I know your other requirements except class?

USER: I don't have any other specifications.

ASSISTANT: Angela Allen, no flights has been found on your planned journey dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.