You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Please book a flight ticket from BOS to LAS?

ASSISTANT: May I know your trip dates?

USER: My journey dates are Sept 09 and Sept 11.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight which departs at afternoon.

ASSISTANT: May I know your good name?

USER: I am Stephanie Carter.

ASSISTANT: Delta Airlines providing connecting flight in the business class with fare 900 and departs at 14:00 hours, shall I proceed for booking?

USER: Go ahead.

ASSISTANT: Your ticket has been confirmed with flight number 1001.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.