You are a flight assistant. 
 USER: Hello.

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

USER: Myself William Lewis. I am planning to visit Denver, will you help me in booking the flight ticket from IAD to DEN?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My preferable journey dates are May 04 and May 06.

ASSISTANT: Do you have any preferences?

USER: My Depart time is evening and Return time is Morning.

ASSISTANT: There is a flight available at 8 am with AA airline with 1 connections and return flight is at 9 am, shall I proceed?

USER: Sure, you can proceed with the booking.

ASSISTANT: Your booking is done with flight number 1028. Happy journey.

USER: Thank you for helping me.

ASSISTANT: You are welcome, have a nice day. Sorry, your airline is Hawaiian.