Title case (which is itself an abomination before the Lord and a destroyer of communication) is the problem here.
It is not “fake reserve bookings” but “fake Reserve bookings” (that is, in longer form, “fake bookings on Reserve”.) As GP pointed out reserve is a proper, not common, noun in this use.
It is not “fake reserve bookings” but “fake Reserve bookings” (that is, in longer form, “fake bookings on Reserve”.) As GP pointed out reserve is a proper, not common, noun in this use.