You can make your reservations appear anonymously on your calendar, so that regular users will only see the resource and timeslot but no additional information. Moderators and administrators, however, will always be able to see additional details.
Turn on anonymous reservations under Reservations Visibility in Resource Administration resource editing. Set Reservation Details Visibility to "Reservation Timeslot Only."
When regular users select reservations on your calendar, they will only see the resource and timeslot but no additional details.