People understand that chat/ messaging/ Slack is asynchronous. There is no onus placed upon you here except perhaps in your hypothetical head. Far more likely

People understand that chat/ messaging/ Slack is asynchronous. There is no onus placed upon you here except perhaps in your hypothetical head. Far more likely is: > Co-worker: Hi, AA. We have a client with a problem, and I could use your help. Please do X, Y, and Z. Okay thanks, bye. > AA: Crickets... > Co-worker (5 minutes later): You there? > AA: Crickets... > Co-worker: Oops, just noticed it's 5:54, I should have known you'd have punched out already, I got it.