Hello, I am interested in buying your products,
Awesome, I have a great Chevy Truck for sale. 
That sounds good, how long have you had it?
It has been in the family for 20 years
That's good, is it in good condition?
It is! It's mostly been in the garage. It needs a little tlc because of age, but otherwise great condition! 
Oh okay, this sounds great, do you think you could go lower on the price though?
I think I might be willing to negotiate. Make an offer and we'll see what we can do
Could you go down to $12,000?
No. This truck even has the chop top and other trucks like this without the top are selling for 20,000-30,000. What about $20,000 even.
That is still out of my budget, it is a nice car, but do you think you could go to $18,000?
Hmm...what if we go 19,000 and I'll throw in new seat covers and full tank of gas
That sounds good.
Awesome, we have a deal then.