Parse this person name:

Lena van Geffen, 1693-1773, flourished 1708-1728
user
first_name: Lena
last_name: van Geffen
middle_names: []
temporal:
- start: 1693
  end: 1773
  type: life_span
- start: 1708
  end: 1728
  type: flourished
titles: []
extra_info: []
assistant