She spoke in a tone of voice that she usually 'reserved' for her students. [=that she usually only used for her students]
She usually 'reserved' her best dishes for very important dinners.
This table is 'reserved' for someone else.
(..) Good evening, Mr. Blaine. You see, major? You have nothing to worry about Rick. Perhaps. Yes, monsieur? - I reserved a table. Victor Laszlo. - Yes, monsieur. Right this way. Two Cointreaux, please. I saw no one of Ugarte's description. Victor, I feel somehow we shouldn't stay here. (..)1942 Casablanca