use google calendar appointment slots
Google Calendar appointment scheduling: How to create a ...
Before we get started, it's worth clarifying that despite the similar-sounding names, Google Calendar appointment slots and appointment schedule are different features.
VisaBot - Easy Schengen Visa Appointment Booking
Appointment slots are handy things, but they aren’t a part of most free online calendar services. So, if you use Google Calendar, you also need to use a service like Calendly or WhenIsGood to actually schedule events with someone else.
Scheduling Appointments with Google Calendar: How to Do It
Scheduling appointments with Google Calendar is very easy. Even coworkers or clients that don't have a google account can schedule appointment slots.