If you have any struggle with display the right information in Room Booking Application this could help you. By default, many Provider or on premises systems has a default behavior by displaying the Organizer instead of the topic of calendar events of the room mail box calendar. You can change the setting by using the following Power shell executable in Office 365 or on your own On-Premise Servers.
To switch that off you can simply run the this cmdlet:
For Exchange Server 2016, Exchange Server 2013 or Exchange Server 2010
• Set-CalendarProcessing -Identity -DeleteSubject $False -AddOrganizerToSubject $False
In Office 365 do the follwoing steps:
Make sure that you have the execution rules