My experience with Siri is that it’s utterly wretched, worse than useless. That sounds harsh, but it’s not really intended to be: to be of use to me, this kind of thing has to be at least as good as dealing with a person and Siri comes nowhere close. It seems as if others have managed to develop a report with it, but I find myself on the receiving end of some variation of, “I’m sorry but I can’t do that,” far, far more often than not.
I don’t have any experience with other voice assistants, but I don’t hold out much hope for them either.
Oddly enough, my car has voice input for all kinds of functions that work far better than Siri, if only because the ambition is so much lower. The words or phrases that it can understand in a given scenario are displayed on the screen, and as long as I don’t slip too far into a Canadian accent, it always understands what I want it to do.