Tracking COVID 19 Vaccine Doses

Has anyone come up with a plan on how to track and recall patients who are overdue for second COVID 19 vaccine dose? Our clinic has not started providing to patients yet, but would like to be prepared. We plan to encourage offices to book an appointment for their second dose, immediately after the first - however if a patient cancels or no shows, we want to be able to recall the patients as quickly as possible.
Thanks!