The OnBoard role of Concierges is handled slightly different in Forum. The role name in Forum for Concierges can be either Managers or Community Managers depending on what tasks they are allowed to perform. There's also the concept of User Groups to think about where you can add some users to a certain User Group to be able to approve requests; whereas OnBoard Concierges were always allowed to approve any requests.
The notifications in OnBoard were not necessarily tied to a Concierge role. In the case of notifications when a room (also equipment or service) was booked or requested, the notification was tied to the user that was set on the "approve" field, or on the notification field which may have been Concierges but they didn't have to be in that role to get the notification. The same goes in Forum.
For reservation notifications in OnBoard, when a user made a reservation for another, it was possible for the "creator" to get a notification email in addition to the reservation "owner". Typically, Concierges made reservations for other users but this was also something delegates can do. So again, the notification was not tied to the Concierge role as a default but more so what task is being performed, and by whom; but also depends on how the system was configured.
In a future release of Forum (R9), the creator of the reservation will receive a confirmation and a reminder email as a default.