Parse this person name:

Thijmen Veenstra, 1243-1308, flourished 1273-1296
user
first_name: Thijmen
last_name: Veenstra
middle_names: []
temporal:
- start: 1243
  end: 1308
  type: life_span
- start: 1273
  end: 1296
  type: flourished
titles: []
extra_info: []
assistant