Parse this person name:

Boaz van Dokkum, 1224-1298, flourished 1240-1251
user
first_name: Boaz
last_name: van Dokkum
middle_names: []
temporal:
- start: 1224
  end: 1298
  type: life_span
- start: 1240
  end: 1251
  type: flourished
titles: []
extra_info: []
assistant