1st Step: Create a smartlist.
In Marketing > Smartlists > Click on "Add a list"
Indicate the name of your list > Write a description > Click on "Save"
2nd Step: Select the filters.
Click on "Add new filter"
Here, there are two filters to choose.
The first one in Passes > Pass (appointments) :
"Has an appointment pass"
"Expires in more than 1 day"
Owns "More than 1 credit"
The second one in Bookings > Number of bookings
"Has booked 0 lesson"
"Occuring on or after the" date desired