Multiple appointment suggestions for a client

Hello.
Here is my suggestion/schedule.
On calendars such as Notion calendar, it is possible to select three proposed time slots via the calendar (grayed out because they are temporary). The person receives an invitation by email or a link via WhatsApp, for example. They have access to the calendar with the three options, and as soon as they choose a slot, the other two are automatically canceled. The chosen slot is then blocked and appears clearly on the calendar. The service provider receives confirmation of the appointment by email.
Have a nice day👋