You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to make a reservation from DCA to DEN?

ASSISTANT: Sure. I can help you. Can I know your travel dates?

USER: My travelling dates are on May 21 and May 23.

ASSISTANT: Noted. Please tell me your name.

USER: My name is Brandon Parker.

ASSISTANT: Thank you. Is there any class preference?

USER: No.

ASSISTANT: Ok. Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: Noted. Please wait for a while, let me check for the available flights.

USER: Sure.

ASSISTANT: There is a flight having single connection with Hawaiian airlines and the ticket fare is 400 only in business class. Flight will take-off at 0:00 hours and arrives at 6:00 hours. Shall I book the ticket for you?

USER: You can proceed.

ASSISTANT: Happy to inform you, your ticket is confirmed successfully and your flight number is 1003.

USER: Thank you.

ASSISTANT: You are most welcome.