[Honestly, Tifa could easily pick him out in a crowd if she wanted to, but the twist here is that she isn't all that keen on going just yet. She promised him that they would leave once she did find him, so she'll take her sweet time.]

Well, he's got an electric tail and a set of big black ears on his head. [She brings her hands up to motion a pair of dog ears.] But it's so crowded in here that I haven't seen him.

[It's entirely likely that he left the festivities to find a quiet place to wait for her, so this feels like the perfect excuse to take a look through the rest of the castle.]