Parse this person name:

Alessandra Gradenigo, 1761-1840, flourished 1776-1803
user
first_name: Alessandra
last_name: Gradenigo
middle_names: []
temporal:
- start: 1761
  end: 1840
  type: life_span
- start: 1776
  end: 1803
  type: flourished
titles: []
extra_info: []
assistant