"My name? OH, my naame. It's uh... Uh..."

There is no doubt the confundus charm has worked but the man choose to follow you where you steer him.

"Chocolate?" This certainly piqued an interest. "Don't mind if I do. It's not dark chocolate is it?"

See how caring you are, offering the man some chocolate. It definitely helps after a dementor attack, confundus charm in place or not. Now, it's time to find your way back. Preferably without another dementor encounter so keep your eyes peeled and your ears open...