The Book a Room template app is a Power Apps canvas application that allows users to assocate a room reservation with an existing O365 Outlook meeting, or to book a room without a meeting. It was built using the 'Office 365 Outlook' and 'Office 365 Users' connectors.
To import this template app, please download the Book a Room template app zip file: Book a Room Template File
Then follow the instructions for importing a canvas app package