Not returning clients

Hi. We are preparing to open a fresh new beauty salon in our local neighborhood. 

One issue we are considering particularly are clients who don't come back (such ones come 1, 2 or 3 times and then suddenly disappears for some unknown reason).

I am very interested about how you are dealing with such problem if you have one? Maybe you don't even track their visit history and are sure that those who comes back compensate those who dont?

Thanks!