The reason you tell several different people why you are there is because that is important. if a system doesn't they need to start!
people often remember things when asked latter. this gives more opportunity to ask about everything you care about even if you forget the first time.
people sonetimes grab the wrong chart. This helps ensure that they check for things that matter to you and not someone else - your history is on the chart if they are watching you for something weird in you history this is important.
Or the patient makes the mistake. I've seen it happen:
My wife has a foreign name--an English speaker coming at it cold is going to butcher it. Someone gets it right--either they've been told or they speak some Chinese. (It's not hard to say, but you have to know the Chinese Pinyin rules to get it right.) Over the decades we have grown used to responding to anything in the ballpark and then sitting back down if someone else responds. Oops--L shaped waiting room, we didn't see the somebody else. She ended up in back, the check caught it there.
Or look at my own name. That's the male spelling--but most people don't realize there is a male spelling. It's caused confusion over the years.