Hi, I'm interested in buying the matte black iPhone 6 but I have some questions.
Excellent.  Go ahead.
First, are there any scratches, dings, or other imperfections?
The phone is practically like new.  No scratches or dings, etc.
Great. Do you know the retail price by chance? How long have you had it? What makes it "custom?"
I do not know the retail price offhand.
That's okay. I can look it up.
I think I have had it like six months maybe.
Ah, not long. Why are you getting rid of it?
IPhone 7 is out.  I want that one before the new one comes out!
Haha I understand! It's for my husband. He broke his phone and doesn't want to spend a ton on a new one. Would you accept $125? I found a gold one for $120 earlier but it was too far. 
Ouch!  No.  I'm sorry.  I can only go as low as $300.00.  It has 64 Gigabytes!
That might be a bit out of our price range. Does it come with a charger?
Yes, it comes with a charger, and as indicated, it has a custom paint job!  It is totally worth it.