Parse this person name:

Nina Gradenigo (1867-1947, flourished 1897-1919)
user
first_name: Nina
last_name: Gradenigo
middle_names: []
temporal:
- start: 1867
  end: 1947
  type: life_span
- start: 1897
  end: 1919
  type: flourished
titles: []
extra_info: []
assistant