Parse this person name:

Steven Seifert, 1459-1526, flourished 1487-1506
user
first_name: Steven
last_name: Seifert
middle_names: []
temporal:
- start: 1459
  end: 1526
  type: life_span
- start: 1487
  end: 1506
  type: flourished
titles: []
extra_info: []
assistant