Yes but... Siri is (to me) not there yet. Promising but not there.
Siri is unaware of so many things.
A simple command that would actually be useful (but fails totally):
« Siri, remind me to buy milk the next time I go get groceries. »
And even then... I should not have to mention the part about « groceries ». The request should be perfectly understood with a full stop after the word « milk » and a reminder should pop up automatically whenever I am in a grocery (any grocery).
An even better Siri would also be able to a categorize things properly. For example, if later in the day I say « Siri, I will need chicken, butter, salt and cardamom for my next recipe », Siri should automatically add those to the « milk » next time I go to the grocery.