Parse this person name:

Kai van Waas, 1608-1657, flourished 1634-1652
user
first_name: Kai
last_name: van Waas
middle_names: []
temporal:
- start: 1608
  end: 1657
  type: life_span
- start: 1634
  end: 1652
  type: flourished
titles: []
extra_info: []
assistant