I own a first.last@gmail.com address and it turns out there are a lot of people who share that name.
So when I started receiving emails for other people I just hit spam, until the day that wasn't enough. When I noticed that Google Assistant was telling me about flights and hotel bookings for other people who share my name whose email I'd long deleted.
And is it possible to delete those things? To rid yourself of the various places the intelligent data emerges? Seemingly no. I found no way to stop being told about these actions relating to other people... constantly being shown PII relating to those other people (flight booking numbers, delivery addresses for things they'd ordered).
I deleted and marked those emails as spam as much to ensure I wasn't receiving other people's PII... yet Google was "intelligently" preserving this and showing it back to me at every opportunity.
Very frustrating, and it makes me wonder if I ever enter an email incorrectly where my personal data will end up.
Edit: I couldn't even see the flights I've been prompted about recently on https://myaccount.google.com/purchases so I guess there are additional systems that have similar functionality.