Hello. Betty Williams here.
user
Hello, how may I help you?
assistant
I am planning to book a flight ticket from IAD to LAX.
user
Sure, may I know your preferable dates?
assistant
My preferable travelling dates are from 08/18 to 08/20.
user
Yes, I found  a flight-1015 with Delta airlines, can I proceed?
assistant
Yes.
user
Yes, your ticket is confirmed.
assistant
Thank you.
user
Thank you for contacting us.
assistant