Hello
Hi! Interested in the Helix?
I am. Is it in good condition? I have been looking for a quality one for some time now.
It's brand-new, in the box, still sealed. As good a condition as you can get!
Great news. How much would you like for it?
It's listed on Amazon at $839, but I'm willing to let it go for less, obviously. 
I was hoping to pay around 400 dollars.
That's a little low, less than half what you'd get it for in store. Can we bring that up some? Maybe $550?
550 sounds good. Can I pick it up today?
Sure! Works for me! Thanks.