SERVICE ASSISTANT. A Dishwasher/Service Assistant at Denny’s plays a special role in the overall operation of the restaurant. Your work makes everything tick like a clock. A Denny’s Dishwasher/Service Assistant has a “Guests First” attitude, engaging in friendly conversation with guests & employees as you perform duties. Responsibilities include. Maintains the dish room and ensures that all dishware, utensils, pots and pans are thoroughly cleane...