This is a tough one - but like elephant_with_cape said, the interaction in the bookstore between the two named female characters is minimal, and really just sets up the opportunity for Julie and Eivind to speak.
The request re: yoga book is definitely not a conversation - in fact, Julie is so distracted by Eivind's presence that she can hardly focus on Sunniva's question.
For a movie with a female lead, I was disappointed that the main character's personality/motivation wasn't explored in more depth; it was a superficial story that placed more emphasis on romantic connections than on anything else.
There are more than 2 named female characters, though only two are really important : Julie (lead), Sunniva (Eivind's ex)
They talk to each other :
Julie speaks to Aksel's friend briefly about her writing, the friend is not named, and the conversation veers towards parenting.
Julie talks to her step-sister about her football matches, but she is not named.
Julie and Sunniva talk very briefly in the bookstore as Sunniva is looking for "Green Yoga" so technically it passes. However, I would argue that the purpose of the scene is to show Eivind with Sunniva and therefore that the purpose of the interaction from a cinematic sense is about a man.
I was surprised when I looked back through the film, that there are very few interactions between women. In the reverse, Aksel speaks with his named friend about his comic book adaptation ; but aside from that there are few interactions between just men.
This film is hinged on relationships between genders so it makes sense that nearly all the interactions are between men and women.