Slot booking system using google apps script, web application and google calendar.
checkout the blog for more information
https://kevin-v.medium.com/how-to-create-slot-booking-system-using-google-apps-script-and-google-calendar-69294ad30c2f
https://script.google.com/macros/s/AKfycbxR9xu5YszdU6QOaiP81iVdBR7mLup6oDcggUVGecwvJ7fD5sWXfgcLNFQoTF9hxCIs/exec
https://docs.google.com/spreadsheets/d/1tBGDB2dML2XQgoWR-B1_mVQSo-PROhMl6B1FySiFhP4/edit
You can customize available slots and timing for the week days from the config sheet in real time.