In Assassin's Creed Valhalla you can acquire the skill of charisma, which will give you additional dialogue options. Maybe you will find it useful in some missions. This page of our guide describes where you can find the locations involving flyting within the Rygjafylke region.
In Rygjafylke you will find a man who wants to talk to you. The conversation will take place in the town of Stavanger. He is waiting right next to the port. It is easy to see him, because a dialog icon appears over his head.
It is easy to respond to the first complaint "your looks make up for the lack of brain".
For the second dialogue you have to use the third answer:
"they seem perfectly placed to give children a scare"
The last answer and you have it out of your mind. Choose the first answer "no, seems it disappeared somewhere in the folds of your fat". After a series of thrusts, your opponent will give up, pay you his respect, and, of course, give you money.