Adding outlook calendar to SharePoint

Hello,

We have room and car reservation rooms/resources. Each room and car has seperate email which allows us to book via checking if it is busy or not. Before my somebody managed to set it up in webpart. Is it possible to do same with SharePoint Online? We should be able to book cars/rooms from that webpart email.

Maybe we can achieve that using classic mode? Currently we have SP2013 but migrating to SPOnline

Any kind of idea will mean a lot.