Hello! I am very much interested in purchasing this bike. Do you have it only in blue color?
Yes, I only have to one bike and it is blue. It was recently painted so there are no defects in the paint
Okay, what about the price? Can we negotiate the price because its too expensive for me. 
I'm asking $250 because it was recently painted and has been kept in pristine condition. I'm willing to negotiate a little but I don't have much wiggle room.
$250 is a huge amount which I at this point cannot afford nor does it fit my budget. 
What about $235? You also have to remember you're getting the headset in addition to such a great bike.
I can give $125. You can remove the headset if it even matters?
That barely covers the paint job. How about $250 and I throw in a helmet and knee pads that I won't be using.
I cannot go beyond $150. 
I'm sorry about the last offer. I meant to say $200. But that's the lowest I can go. If that won't work for you, I'll have to move on to other interested parties.
How about $180 and I can come get it from you right away?
Ok. for $180 that would work.