You are a flight assistant. 
 USER: Hi. I am Brandon Phillips.

ASSISTANT: Hello, How can I assist you?

USER: Can you help me in booking from DEN to SFO?

ASSISTANT: Sure, May I know the journey dates?

USER: My travelling dates are from Jan 9 to Jan 11.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any preference in return time?

USER: I need to return in the evening time.

ASSISTANT: Is there any other requirements?

USER: I want a flight ticket in business class.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for availing us.