You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket from San Francisco, SFO to reach Charlotte, CLT?

ASSISTANT: Sure, may I know your name please?

USER: My name is William Carter.

ASSISTANT: Ok, may I know your travelling dates please? Is there any class preference for you.

USER: My journey dates are from Feb 21 to Feb 23. I prefer to travel in business class.

ASSISTANT: Do you have any other specifications please?

USER: I need a stop over in between journey.

ASSISTANT: Sorry Carter, there is no flight found as per your travelling details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.