My practice has been a bit weird on that, where we have some days, and even weeks, where the short term cancellation rate once our automated reminders go out 48hrs ahead of the appt time is basically zero, and then other days where it may be approaching 1/3rd cancellations, and weeks where it's probably close to 20%. Fortunately my staff has done a very good job at handling those cancellations the vast majority of the time.
The same day dreaded no-shows have as always been weighted towards the medicaid patients that we see, and we generally double book against them from day 1.
Heck, one of the weird ones was last week when the snowstorm rolled through the Northeast (we got about a foot at my office) due to the timing of the storm where it was projected to dump the majority of the snow from about 6AM through early afternoon (and that held true), we cancelled the day out, ahead of time out of travel safety, and when my front desk staff called to notify patients, over 75% of them said that they'd come in if we changed out mind about the storm and/or decided to open up later in the day.
20+ years into this, I have come to accept that the reality is that no matter how well you try and plan out a schedule, the reality is that sometimes it just doesn't work out that way, and that you can't control the actions of other people (your patients) at times, and that's just life. The reality is that these days, if that
occasional no show happens (as did to me this morning for an hour) I don't stress about it, and just try and enjoy an added few minutes in my day to relax a little. Probably took me about 10-15 years of practice to be able to be truly comfortable with those occasional times (as long as they're just that, OCCASIONAL times

)