You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to book a flight from DEN to JFK, will you please help me in booking a flight?

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

USER: I need a connecting flight.

ASSISTANT: When do you want to fly?

USER: My planned dates are on Mar 22nd to 24th.

ASSISTANT: Do you have any preference with the class?

USER: Yes, I need a business class.

ASSISTANT: Can I know your good name?

USER: Sure, my name is Elizabeth Campbell.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: No issues, thank you.

ASSISTANT: Thank you.