Parse this person name:

Helena Rietveld, 1908-1970, flourished 1930-1952
user
first_name: Helena
last_name: Rietveld
middle_names: []
temporal:
- start: 1908
  end: 1970
  type: life_span
- start: 1930
  end: 1952
  type: flourished
titles: []
extra_info: []
assistant