Good luck with this one. The series I am looking for is about an Android (Woman) who runs an old cafe in the middle of the country side. Apparently a lot of humans moved onto a massive flying ark that is super high and occasionally flies overhead every few years. She meets various people and other androids but there are two that stand out.
One is an unknown man that you read the chapters from his first person perspective but doesn’t speak.
The other is a human that she befriends when he is just a child and shows him grow up throughout the series.
The last scene I remember is of a young girl on a hill which I think is the boys eventual daughter or granddaughter and she is friends with a large flying animal that is going to take her somewhere. I haven’t seen it anywhere since I read it almost a decade ago but I trust the power of reddit.