I hate the term user story. Not because I hate user stories, but because people usually look at you funny when you ask them for it.
If this happens to you, instead of asking for user stories, ask who this is feature is for, what the feature really means, and why its important. Now you have successfully figured out the user story, without having to tell the requester to start their sentence with As a.
These pieces of information are super important in prioritization. In a month, if you don’t know why something is important because you forgot, well you can’t prioritize can you?