Siri's Personal Context Understanding in iOS 18

I read an article about Siri can now remember previous interactions and use that information to provide more relevant responses. For example, so I tried out like "When's the next England football game?", and "Add/Schedule to calendar", then it added the date into my calendar and when I ask "Delete it", then it deleted it.

It only works with a number of sports games like International Women Football Games, some American Soccer Games, sometimes Premier League Football Games,...

But most of times, it doesn't work smoothly. Do you know any other exact command that works perfectly?

Or, is there other features that I can try out with Siri's Personal Context Understanding?