Hello I am really interested in this product
That's great. I'm interested in selling it to you.
How old is it? 
The iphone 5 was first released in 2012, but I guess I don't remember when I bought it? It's almost like I would have remembered if I had thought to write it down in the product description. Oh well.
Thank you for the information. However, the price is too high for me. can we work on it?
Yes, I suppose we can negotiate. Let's negotiate, that's what I always say.
I can pay about $82 for it
Well, that's a pretty attractive offer. Now we just need to decide where to do the deal. Would you like to meet up in a Tmobile store or would you rather meet up at a gas station?
Gas station works really well for me. Thanks for the options. When can we do that?
Well, I always think it's best to wait until it's really dark and spooky to meet up at a gas station, maybe we can meet up at midnight, exchange the phone and just see where the night takes us from there. Maybe get some slurpees from the gas station?
Okay I think we're done with the deal and will meet up tomorrow then! Thanks
Great, looking forward to meeting you in a gas station.