Does anyone know or has found a way to set a priority on users to have the ability to cancel another user's booking for a room and then send that user an automatic email informing them the room is no longer available?    

Thanks, 

-Mike

Hello Mike,

You can set a delegate for the resources mailbox according to the following article:

https://technet.microsoft.com/en-us/library/bb124973%28v=exchg.141%29.aspx?f=255&MSPPError=-2147217396

The logic is



Picture from:
http://blogs.technet.com/b/exchange/archive/2009/02/26/3407028.aspx