Parse this person name:

Ivy van der Berg (1239-1301, flourished 1257-1272)
user
first_name: Ivy
last_name: van der Berg
middle_names: []
temporal:
- start: 1239
  end: 1301
  type: life_span
- start: 1257
  end: 1272
  type: flourished
titles: []
extra_info: []
assistant