In my own Joann's some time ago, I went in to find bobbins for my new Brother, which did not seem to like my Singer ones. I had, of course, put the manual in "a safe place" which is still safe because I can't find it. (Later, much later I downloaded one from the Internet. Why I didn't do that first I don't know).
The young lady who waited on me said she didn't know either, BUT took out her own cell phone, asked my Brother's number and checked with the online Brother site. She got the number of my bobbins and led the poor old lady to where they were located. I was so charmed by her actions I told the check out lady, who handed me a form to fill out about the clerk, which I was glad to do. I hope it went on her permanent work record, it sure did make me feel better. And the Brother has worked nicely since.