Parse this person name:

Alex van der Kaay, 1287-1345, flourished 1307-1321
user
first_name: Alex
last_name: van der Kaay
middle_names: []
temporal:
- start: 1287
  end: 1345
  type: life_span
- start: 1307
  end: 1321
  type: flourished
titles: []
extra_info: []
assistant