Parse this person name:

Yfke Geertsen, 1326-1381, flourished 1351-1361
user
first_name: Yfke
last_name: Geertsen
middle_names: []
temporal:
- start: 1326
  end: 1381
  type: life_span
- start: 1351
  end: 1361
  type: flourished
titles: []
extra_info: []
assistant