Sorry but no. If it's asynchronous and I don't need a response in a short time, I'll email you. If I say something on Slack to a person, and don't get a response in a short timeframe (~5 minutes), I go to someone else - whether that's a coworker or a manager. And when I get told, "you'll have to ask [unresponsive]", I say, "Oh, I tried to reach out to them, they didn't respond. Can you reach out and see if they're available?"
That way, I've gotten somewhere closer to my answer, and I've put another person on the scent of the unresponsive one.