Yes, that would work. Look for someone with dark hair in a grey coat.

[The park isn't crowded today, so Nathan is likely to see the man he agreed to meet in relatively short order. He's wearing a dark grey trenchcoat that hangs off his gaunt frame, he appears to be in his mid-twenties, and most of his adjectives seem to be dead-on; pale, haggard, and disheveled, he looks downright brittle.

He sees one man who looks like his temperament might match the one he gleaned from the interactions on the network.]

Nathan Mithryn?

[His voice is soft, clipped and precise.]