what if you’re trying to sell something to someone and they say no?

to be more elaborate, say for example you’re trying to sell a membership to someone. you ask “do you have a membership with us?” and they say no... how do you go about that when you’re trying to sell it. this is for a job interview, so i can’t say “would you like one?” or “okay that’s alright” .. i have to convince them and interest them into hearing more about the membership. help ?

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