That part of the game seems to be misleading for some players. When you encounter a new NPC, you should "TALK TO him/her/it" to establish contact and then "ASK him/her/it ABOUT things". I guess I will modify how the library manager reacts after the jam ends.
Yes, I seemed to do everything other than ‘talk’! 🤭 I started again (couldn’t find my saved version), the first thing I did was ‘talk’ and I got the book.