What can you tell me about the Trek you have for sale?
it's a great bike, but needs a little work.  It needs new tires, seat, and brakes
I see that.  Why have you decided to sell it?
I got a new bike crom my wife for my birthday
Lucky you!  Treks are nice bikes: I hope you got another.  I'm willing to pay $60, and I can pick it up today.
$70 and you have a deal