Nope, I looked at that. The reservations is for a customer to look or put a specific date into a calendar to see if the business has room for them.
I think some sites link out to a hosted service for that kind of thing, but I'm not familiar with them. If you happen to find a hosted reservations service you like, you can link out to it from either type of website. If you prefer to install and manage your own WordPress plugin such as the WordPress.org one you mention, then you would need to switch to WordPress.org. Try looking around at other similar websites in your business area to see what similar sites are using for their reservations.