You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a flight ticket from CLT to PHL?

ASSISTANT: Sure, when are you willing to travel?

USER: My travel dates are May 17 and May 19.

ASSISTANT: May I know your name please?

USER: I am Kevin Carter.

ASSISTANT: Do you have any preferences?

USER: I would like to prefer business class flight ticket. I prefer connecting flight for this trip.

ASSISTANT: Sorry, no flights were available at this moment.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.