Final answer:
A restaurant staff member can create a positive impression by efficiently resolving customer complaints and improving service efficiency, maintaining professional conduct, and displaying a positive attitude and enthusiasm.
Step-by-step explanation:
An action by a restaurant staff member that is most likely to create a positive impression on a customer includes promptly resolving complaints and improving service efficiency. For example, managing the lunch-hour rush effectively by organizing a clear system for customers to line up can lead to positive results. Implementing floor markings to guide customers to the right register, as done by a lunch-hour manager at Gavi's Fast Food Restaurant, resulted in no customer complaints during high traffic periods, reduced stress for the customer service clerks, and an increase in the number of customers served daily.
To further ensure a positive impression, staff members should maintain a professional appearance, treat everyone with respect, complete tasks timely, and demonstrate a commitment to excellent customer service. Displaying a positive attitude and enthusiasm, along with respecting the authority of a manager and being a solution-oriented team player, also contribute significantly to a customer's positive experience.