Hello
Hi there. Are you interested in the bike?
Yes I am. Is it in good condition? I really want a good one, cause my last one broke down and cannot be repaired. 
Yes. It is in great condition, almost like new.
How much would you like for it?
Since it's in such good condition, I'm asking 850.
I would like to pay 425. Would that work for you?
That's too low. The bike is like new. I hardly ever rode it. It's always been inside, so no wear and tear.
How about 700 then? 
I'll bring it to you for 800.