I claim the ornamental design for a teller station, as shown and described.
FIG. 1 is a perspective view of the teller station;
FIG. 2 is a front view of the teller station; and,
FIG. 3 is a top view of the teller station.
The broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design. The rear and sides of the teller station, not shown, form no part of the claimed design.