Google Calendar lookup fails with Siri

I am using Siri on iPhone 16 ProMax.

I want to say "Siri when is dentist" or "Siri when is haircut". But, it doesn't work.

I have already added a Google account in Settings->Apps->Calendar and I've set the Default Calendar to my Google id.

However, Siri is able to add events in Google Calendar with "Siri arrange meeting" and so on.