Earlier quoted context omitted.
And "Remember their name".
I remember the book saying something like "a person's name is the most beautiful sound in the world to them." The book may say to say their name back to them (I don't remember right now), but that's not what I took away from it. It reminded me of when people would make fun of my name (first and/or last) or bring up someone famous who has the same first ("Donald Duck") or last name ("are you related Joan Rivers?"), or…
I do think Dale Carnegie overemphasizes the importance of saying people's names, and in fact saying people's names in conversation often sounds forced and manipulative, but maybe that's just a cultural shift over the past century.