how to set availability on hourly base?

Hello,

I have installed appointment + plugin in my site.
In this plugin we can set availability on the basis of the start time and end time of the day and we can allocate break time in admin panel.

But what I need is to do is from fron-end if any use logged in and want to set the availability on the hourly base. Something like from the week view whatever the hour slot I want to be available than I can set.
Here I am not talking about booking the appointment on hourly base from front-end. I am talking about the set availability on hourly base from front-end.

Please help me to fulfill my needs. It's very important for me.

Thanks in advance.