Hello! Are you interested in the bike I have for sale?
Hello! I am interested! What are the terms?
I am asking $2000.. It is practically brand new.
$2000 is a little high for my budget. Lets start at around $1100
Everything on the bike is under 400 miles. every part is brand new. It is basically customized. $110 is way to low to let this go. I can do $1850
i can do without the brand seat post. lets call it even at $1500. Ill pick it up from you so you dont have to worry about delivery. 
I would not be able to sell the seat post alone.. it would have to go with the bike. $1700 I can do
we're getting better. I can do 1650. since we're not talking about a warranty, i need to cushion myself from potential damage.