a warm body - A simple check to see if someone is still alive, like a text

A simple check to see if someone is still alive, like a text saying 'hi' or a random DM that just says 'are you here?'

I sent you a 'hi' just to see if you're still alive.

You're still here? I was worried you died.

I texted you 'are you here?' because I was scared you weren’t.