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Consider a situation when you convinced someone to do something which they initially had severe doubts about. Talk about the methods you have used to convince someone as well as how persistent you needed to be. Show that you enjoy influencing other people as well as being good at it.
I never force my clients to buy my products, i only detail them with the benefits of buying my products and the cons of not buying my products. What really wins the game of influencing a client is the level of relationship you maintain with that person.