If said person is breathing leave them and wait for assistance if said person has had previous episodes and known medical conditions move them into recovery position and follow procedures given to the workplace if person isn’t breathing slightly tilt head back to allow maximum airway support if heart isn’t beating start chest compressions.
Do not move the person unless there is serious danger such as an approaching fire. If there is no need to move the person, keep checking for the persons awareness while you wait for help to arrive.