Please bear this is mind when you cancel in the same month as the booking.
My bookings can be as short as 3 hours, and I often do 2 (sometimes 3) per day. Short notice cancellations and time adjustments can significantly affect my monthly earnings.
I prefer to book a month in advance to plan my monthly outgoings. I end up out of pocket when I lose bookings with a couple of weeks' notice or less.
This summer, I have been unable to make up for many cancellations. None of these cancellations were due to sickness and over one week's notice was given.