Hello, how long have you had this bike? How many miles would you say it has on it?
Hi there. I've had this bike for a season and a half.  About 1000 miles on it.
Kind of a weird brand name. I've never heard of "Niner".  Anyway, I'm looking to pick this bike up for $1,500.
It's a really known brand name in the biking world.  I replaced the components in this bike so it's actually worth more than my asking price. How about 1850? 
Himm, kind of steep. I have $1,500 cash right now in my pocket. What do you think?
I think I'd settle for meeting in the middle at 1750
How about $1,650?
Okay. It's a deal.  You've got an awesome bike