I see you're interested in my bike. Have any questions?
Hi. Yes I am interested in the bike. 
Just so you know, it's an adult build, so best for someone over 5'6". Did you have any questions?
How old is the bike?
It's pretty new. I got it as a Christmas present last year. 
In the photo the handle grips look worn through....what overall condition is the bike in?
Good condition. I've used it as a commuter bike for the last 6 months or so, so it's got some wear, but it still works great. Even has new BB bearings. 
Ok. I'm not sure I can do $200 for a used bike, would you consider negotiating on the price?
Sure, as long as we're not talking too low. What price were you thinking?
I was thinking $100 if there are no extra bells or whistles.