Parse this person name:

Juliette de Boer (1251-1302, flourished 1274-1293)
user
first_name: Juliette
last_name: de Boer
middle_names: []
temporal:
- start: 1251
  end: 1302
  type: life_span
- start: 1274
  end: 1293
  type: flourished
titles: []
extra_info: []
assistant