Zatanna never turned down the chance to learn new magic, most mages were the same, even those who weren't currently trapped as cats or other domestic animals. Of course, even as herself she would have been willing to take his hand, perhaps too confident in her own abilities to worry much about potential dangers from a man she didn't know. The cat got up, arching her back in a stretch before looking over his hand.
"Right, I don't have thumbs right now, or long enough fingers to take your hand, really so this is just gonna have to do for now." She reached out her little black and white paw and placed it on his palm. "I'm Zatanna Zatara."