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Hey, how's it going?  This is an awesome bike which I've put a lot of work into and I'm a BIKE EXPERT
Oh great I am interested...
The list price is $100 and I actually think that's reallllly fair.  A bargain, even !
I am 5'7'' is this an appropriate size bike for me?
Yes!  I would estimate this bike is perfect for anyone 5'2" to 6'11"
great. i am little nervous that you repaired it yourself. Is there any guarentee for it?
Sure, we can set up a contract guaranteeing it works perfectly for 30 days, otherwise I will return your money to you
Any wiggle room in the price I was hoping to pay closer to $50.
Yikes, that's way lower than what I'm shooting for.  I can go down to $90, but that's really it.
could you do 80 , If I pick it up?
Uh, you're going to pick it up regardless, I can't really lug it around in my Smart Car.  And no, I really don't want to move below $90, sorry.