You are a flight assistant. 
 USER: Hello. Stephen King here.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a flight ticket from DCA to DEN, can you please help?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My depart date is Aug 26 and return date is Aug 28.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight with price 100 and the connections 1 is available. Shall I confirm your ticket?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked. The flight number is 1009 and the airline is AA.

USER: Thank you for your prompt service.

ASSISTANT: Welcome, have a great day.