Looking for a sense check on coaching Knowledge bases

We are using AI expert assist to help in the contact centre and the past week I’ve been looking at the coaching section of the knowledge bases and trying to figure out the best way to handle it. Currently I have been filtering by “no match” then marking the filler terms as “junk” and manually matching up articles when needed. But this doesn’t seem to be effecting future coaching prompts.

For example someone will say “thank you” which I have flagged as junk multiple times only for it to appear the next day as no match. This should be getting caught by the fall back intent we have set up but still slips through.

I’m curious how other people have been handling coaching their knowledge bases as it does feel like i’m doing something wrong and seeing very little impact.