Why is it actually not possible to search specifically for customers who have not yet made an appointment via a specific booking type z.B. Have you booked the web? Currently, only the following is possible: Filter option: transaction type (Reach out to customers based on their previous booking types) Customers who have booked an appointment via [web, Android, iOS, third-party API...] Desirable: Customers who did NOT book an appointment via [web, Android, iOS, third-party API...]