When a customer walks in, get your phone out and jot down all their information for their first visit. The next time they come in you'll be able to simply open the app up again, find their information so you don't go to them empty minded.
* The list is organized my last name (if there's only a first name, it will use that)
* Searchable by name, birthday, and last visit
* Added a 'last visit' field that the user can update
With Family Sharing set up, up to six family members can use this app.