does it introduce itself? like, "Good morning, I am an AI assistant here to help you with memory problems associated with dementia. Some of the things you perceive may not be present for others. You are otherwise healthy, safe, and loved. I have been provided with some memories for you and I will remind you of them when you need them. If this feels like your first perception of this message, please let us know and we can bring you up to date with your medical condition and what to expect."

Then it recognizes faces of visitors and maintains backstories on them, senses the distance from base reality the patient is responding in, and then keeps the patient on track and managing their condition with the least possible suffering.

It seems horrific, but also humane in some cases.