I don't know why, but it is possible to successfully complete a conversation 1 time using "Keep Talking", but when I choose this option to riddle a second time, it always ends up with zero points even if I had the option to end the conversation with 100+ Amity before.
Valks
Siena Volaire
Duras
Fridri Dofricson
Kirklas
Renadlus
This was the latest sequence that worked for me: renaldus, kirklas, fridri dofricson, casto luce, duras, siena volaire. More or less gets me near/over 200 accumulated favour, and minimum favour 40+