You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of service your looking for?

USER: Can you aid me to book a flight ticket from DEN to BOS?

ASSISTANT: Sure, please share me your trip dates.

USER: I planned my journey on the dates Dec 8 and Dec 10.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Myself Anthony Walker.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your class preferences?

USER: I prefer business class flight for my journey.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for opting us.