Hello.
Hello, I am interested in the bike.
Okay. Are you willing to pay the listed price?
No, that is a bit out of my price range for a used bike.  Are you willing to go lower?
I could part with these components for $1900 with a free delivery to you.
I'm worried about the tires condition after the 1000 miles.  How about $1800?  Or new tires and $1850?
I could throw in new tires and a free delivery for $1875. Does that sound fair?
Sounds fair! 
Deal!
Deal!