Parse this person name:

Iwan Niemeier, 1843-1903, flourished 1872-1893
user
first_name: Iwan
last_name: Niemeier
middle_names: []
temporal:
- start: 1843
  end: 1903
  type: life_span
- start: 1872
  end: 1893
  type: flourished
titles: []
extra_info: []
assistant