The auto search is great, if you can add the ability to make it so user can add to the list so the list can grow as more users sign in.
So i created original list of people
people use the auto search to find their name and sing in to a class
new person, Jane Doe, comes to class and she is not in original list of people
so Jane Doe types in her name and once she hits submit button, her name Jane Doe is added to the original list of people
Jane Doe come the next day starts typing her name in the search box and it pops up.
Making the search box dynamic like that. So that as more people come to my gym and sign in the list keeps growing organically