I claim the ornamental design for a booth, as shown and described.
FIG. 1 is a top, front, right-side isometric view of my new design;
FIG. 2 is a top, front, left-side isometric view of my new design;
FIG. 3 is a front elevation view of my new design;
FIG. 4 is a rear elevation view of my new design;
FIG. 5 is a left side elevation view of my new design;
FIG. 6 is a right side elevation view of my new design;
FIG. 7 is a top plan view of my new design; and,
FIG. 8 is a bottom plan view of my new design.
The broken line showing of a keypad on a front side of the booth is for the purpose of illustrating a portion of the booth and forms no part of the claimed design.