Better way to show partial day availability on the calendar?

Hey guys! I'm a student and have classes throughout the week. I feel bad leaving my calendar showing as completely "available" when I know there are periods of time that I cannot pet-sit, but if I mark unavailable then I will probably get no bookings. For example, if I have class from 12-5, I still want to be able to be booked for dog-visits that evening or dog-walks that morning. I put my schedule in my description, but I feel like some people won't bother to read it. Is there a better way to show my exact availability? Thanks in advance!