Which selling activities are more likely to lead to relationship building and nurturing in marketing?

Which selling activities are more likely to lead to relationship building and nurturing in marketing?
to build relationship with the customer, the salesperson need to inform the customer about the product, the uses of its, its availability, benefits, and how it is better from the other. over here the salesperson need to work with the pull strategy by guiding the customer and influencing them with the benefits they can derive from the product. then time to time the customers should be informed about the new product of the company, giving special discount package and time to time an interaction should be done with the customer to create a mind share by sending gifts, greeting etc to the customer on the festivals, occasions. this will help to company to have an advantage on the "top of the mind" share of the customer which will lead to boost sales.