You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Can you please help me in booking a flight ticket from SFO to DEN?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travel dates, please?

USER: My travel dates are from Feb 20 to Feb 22.

ASSISTANT: Do you have any preferences?

USER: I would like to travel in business class. I need a single connecting flight.

ASSISTANT: Kindly provide your name for documentation purpose.

USER: I am Rebecca Robinson.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that there were no flights found with business class.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for availing us.