I wonder if I can get a little help from Medicare to pay for companion aide in assisted living for few hours?

Medicare does not pay for aides. Its a health insurance. The only time they pay is after a hospital stay where Homecare is recommended. Once the OT/PT is done or care of some sort, the aide stopds.

Why does the person need a campanion. There should be activities and you r paying to have a certain amount of care.

Medicare doesn’t pay for companion aides.

Apparently, "no".
https://www.seniorliving.org/companion-care