alt Hacker NewsIt shows where it found the information. In this case, it included a link to a text message from the school which had this info, and quoted it so I could see that it got it right, and it shows the reminder it created so I could see that it's correct. I don't really have to trust it, I can see that it's working.
Maybe you have 5 relevant calendar events but it lists 3 and calls it a day. That is from my experience far bigger type of problem with AI. Hallucination by omission