Activate independent booking admin panels for different WP users. And start using your own multi-user portal, like Airbnb.
Such users (owners) can see and manage only own bookings and calendars (booking resources). Other active users (owners) will not see the bookings from this owner, they can see only own bookings.
Each owner can configure own booking form, own email templates, activate and configure payment gateway to own payment account.
Such users will receive notifications about new bookings to own emails and can approve or decline such bookings.
Check more here.
Available in Booking Calendar MultiUser version.