You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, please send your travelling dates.

USER: Sure, I would like to go on June 10th and return back on June 12th.

ASSISTANT: Noted. Do you have any preferences?

USER: Ensure the return time is in the evening.

ASSISTANT: May I know your name please?

USER: Myself David Jackson.

ASSISTANT: There is a connecting flight available with Frontier airline which departs at 17:00 hours and arrives at 20:00 hours, shall I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1012. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.