Parse this person name:

Lenn Kosten, 1644-1707, flourished 1660-1674
user
first_name: Lenn
last_name: Kosten
middle_names: []
temporal:
- start: 1644
  end: 1707
  type: life_span
- start: 1660
  end: 1674
  type: flourished
titles: []
extra_info: []
assistant