the customer: How long is the computer guaranteed?
me: The computer is guaranteed for 3 years.
the customer: Is the mac book waterproof?
me: The keyboard is waterproof.
the client: I will be working with this computer a lot, is there a lot of memory?
me : Yes! You have 512gb. In addition, this macbook has support for millions of colors and up to 17 hours of wireless web browsing! You will never find so much on another model.
the customer: Ok .. but I find the price a bit exaggerated .. no?
me: The price is quite high, it's true, but it's worth it! This laptop is the best on the market, as I told you before, you won't find better!
the client: Okay, you convinced me! I'll take it from you.
me: Very good choice! How are you going to settle?
the customer: I pay by credit card.
me: Okay. If you want I have an offer for you.
the client: I'm listening to you.
me: With the mac book you bought, you get 10% off our new Apple Watch!
customer: Can I see what the model looks like?
me: Yes, no problem, there you go.
the client: I've wanted one for a long time! I'll take it from you too!
me: Very good choice.
Voilà, j’espère que ça te conviens :)