You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: This is Nicholas White, can you help me to book a flight ticket from DEN to ATL?

ASSISTANT: Sure, may I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: When are you planning to make your trip?

USER: My preferable journey dates are Nov 12 and Nov 14.

ASSISTANT: At what time would you like to depart and return?

USER: Please ensure the book a departing flight ticket in the afternoon time.

ASSISTANT: Lastly, please let me know you connection preference.

USER: I need a connecting flight ticket on this route.

ASSISTANT: Ok, there is a Delta airline with flight number 1003 going on your way in the afternoon and the airfare is 400. Is that fine?

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.