Parse this person name:

Irmtraut Köster, 1375-1421, flourished 1401-1416
user
first_name: Irmtraut
last_name: Köster
middle_names: []
temporal:
- start: 1375
  end: 1421
  type: life_span
- start: 1401
  end: 1416
  type: flourished
titles: []
extra_info: []
assistant