A Cashier is a retail professional who scans items to ensure prices and quantities are correct, assists those who need help or advice on products, and handles returns and exchanges when necessary. A Cashier's primary role is to assist customers in the in-store check-out process. Main cashier duties and responsibilities include ringing up sales, bagging items, requesting price checks, honoring coupons, collecting payment, and giving appropriate change. A Cashier's primary role is to assist customers in the in-store check-out process. Main cashier duties and responsibilities include ringing up sales, bagging items, requesting price checks, honoring coupons, collecting payment, and giving appropriate change.