You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, can you share your travel dates?

USER: My journey dates are from Jan 02 to Jan 04.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight ticket.

ASSISTANT: Let me know your class preference?

USER: I prefer only business class flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please forward your name.

USER: My name is Jack Hill.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

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

ASSISTANT: Thank you for availing us.