Why in the hell would you use this forum for a simple currency exchange from the tow two cryptos? I mean there are services and sites WITH ESCROW AND SECURITY for this like sand on the ocean. AFAIK the easiest and do not even requited registration but have higher fees. But of course you should pay some fees rather then then some stranger coins here.
Because exchanges are not actually safe. Sending some coins to a complete stranger and an exchange is similar in risk involved; they can loose your deposit, they can cancell you account and hold the coins,... and you are paying fees a couple of times: when trading, and when withdrawing. They are also centralized sites with usually KYC policies; which are not really nice. Doing a trade on this forum is way easier, with less fees, more anonimity and even less risk involved, if the other part can be trusted(this one is the tricky part).
I'll support your flag and tag him myself after you've created a proper scam accusation.
I'll also be supporting that flag (may not be DT, but hey, you are a nice guy to deal with)