How you have had to persuade a customer to buy a product or service?

AnswerApplication Question

One of the key aspects of the role you have applied for is to be able to sell products and services to our customers using a conversational style of selling. Please provide an example of when you have had to persuade a customer to buy a product or service which they may not have previously wanted or known about and what was the result?

i think we should have advertisement on television,newspaper or radio all customer can know about your product.