Final answer:
The restaurant's approach of reminding Aunt Linda to make reservations is an example of Relationship marketing, which aims to maintain and enhance long-term customer relationships.
Step-by-step explanation:
The sales approach Aunt Linda experiences from the restaurant is known as Relationship marketing. This strategy is adopted by businesses who want to cultivate long-term relationships with customers rather than focusing on individual transactions. By calling Aunt Linda each year to remind her to make a reservation for her anniversary dinner, the restaurant demonstrates that it values her patronage and wishes to maintain a personal connection with her. This approach not only ensures that they retain a valued customer, but it also enhances customer loyalty and can lead to word-of-mouth recommendations.