Feeling awkward/ guilty about removing clients from my calendar

When I started in private practice I thought it would be easiest to have all my clients in a reoccurring spot each week. However, I have a couple of clients who cancel frequently, within the appropriate time( >24 hrs). As I get a larger caseload I want to take these clients off the calender so they can self schedule/I can have those spots for consistent clients. but I feel bad springing this on them, as I don’t talk about this at intake. What’s a way you’ve discussed this with clients so it doesn’t sound punitive?