Take it off
Short. You received it. You won’t come.
Got it — I’ll take tomorrow off my calendar. No charge. Text when you want to book again.
Client messages you can copy
They’re the ones calling it off. Confirm you heard them and that you won’t show up. Don’t turn it into your own cancel, and don’t offer two new times in the same text.
Name the visit they’re dropping. Don’t rebuild the calendar here.