The SHOW RESERVATIONS command provides information about current
    reservations and concurrent replacements. For each element that
    has one or more generations reserved, the output consists of the
    element name and the following:

    o  For each reservation--identification number, user, reserved
       generation number, date, time, and remark

    o  For each concurrent replacement--user, replaced generation
       number, date, time, and remark

    The elements are listed in alphabetical order.