Life coach needs to remind clients of their assignments and appointment times

"I am a life coach that is employed by a company.

The problem I face at work is that clients either don't show up to the scheduled meetings because they forgot or once they are there, they say they forgot to do the assignments that were assigned to them.

I need software that will automatically remind them of their assigned action steps each day until they are completed and also remind them of their appointment times.

I would pay around $100 a month for up to 60 coaching clients."