Are you interested in purchasing the phone. 
Are you willing to go down on your price?
I will negotiate to some degree but I would also offer you an extra charger, a case and a itunes card 
That sounds good, but how will I know it's a real iphone7? 
575 would be my lowest price
With all the extras I could accept this price if you can assure me it's the real deal.
i can defiantly assure you it is real
Okay $575 deal. Thank you