Hi there! Is your vehicle still available?
Yes, this absolutely gorgeous BMW is still available, but I'm certain it won't be for long!
Great! Is all of the paperwork up to date?
All paperwork is up to date and I have clean title in hand.
Sounds good. Would you be willing to pay for a background check if I make you an acceptable offer>
I have a Carfax report for it in my possession if that is what you are speaking of. 
Yes, that's right. I recently saw a similar model at a dealership for about 30,000 but yours looks better maintained, so I'm happy to make a higher offer for your car. How does 31,500 sound?
According to Kelly Blue Book value, I have this car priced very close to the value.  Given the pristine condition, year, miles, etc. $31,500 is very low.  I will accept $43,000.  Even at this price, you are getting an awesome deal!
What if I pick up the car myself? Could you do 35,000?
Sorry, can't do it.