Not OP but mine are, anything wrong with it? Communication aims at information exchange, if you wanna say hey just say hey, we don’t need to waste away doing empty, false gestures at each other. You want to learn something I know? Happy to help! Vice versa? I hope you also don’t mind.

Wanna waste air with saying empty words, devoid of any actual meaning? You’d get the most appropriate version of “Yeah” and a stare urging you to get to the point.