As a … I want… so that…” is a new-fangled user story format. The original XP user story format had no rules, so you could simply highlight any phrase in a use case and call it a user story.
Personally, I feel sorry for anyone who has to write “As a… I want… so that…” for 200 user stories. Kind of like being kept after school and having to write “I will not write silly user stories in class” 100 times