This is tricky because there's no guaranteed "path" that beats the game, since the conversations are a little dynamically generated. I can tell you that you need 4 words, and one of those words is "hope" at the beginning (to get you started). If you play a correct word, you'll get a little popup of the player character talking to themselves, for example, "We have rapport. How can I get him to think of us as old friends?" That's a clue for another winning keyword. If you turn on EASIER mode, then the right words will be highlighted as you manage to discover them, which will help a little.
It's definitely harder than I intended, but thank you for trying it out anyways! I appreciate your time. :)