This is a red flag, don't trust having deals with someone you don't know, try to learn on how you could do things by yourself, its not that people don't go into arbitrage, but a reasonable person will not be giving you a collaboration on arbitrage trading, don't let such person scammed you by any chance, they may appear to be real and sincere just to gain your trust and finally attack you, nobody from anywhere will contact you for a deal that will profit you without giving him the highest profit at your own expense.