This sounds like a social engineering scam. What that means is you've gotta use your social skills to seduce the victim into beliving you. This will make that process ALOT easier, as he's trusting you when you get to that last part he will belive you when you show him that you've "sent the money"
Seducing a victim with some easy steps:
1. Don't stress them into trading
2. Talk about some random crap like World of Warcraft, Real life, Work or what ever. Don't overdo this tho.
3. Use smileys but do NOT overdo this, it'll make you look very childish and most people don't trust childs.
4. Show sympathy for your victim if needed. (Use with common sense)
What I'm trying to say is that you should act very normal in a trade. Just chill, rather speak with them for an extra 20 minutes than spending another hour getting your next victim.
To explain the steps abit better:
1. This is the part when you spend the extra 20 minutes basicly.
2. This is what you add in the 20 minutes
3. Smileys will make your victim feel more confortable with you. He'll notice that your human, that you have feelings and you're not some mean-bean-scammin' machine.
4. Sympathy.. Let me make an example:
V: Just got home from work, I'm really tired sorry for taking time to reply
U: It's cool mate, I know how it is
That'll show him even more that you have feelings.
I hope this helps you out abit
- Jesus