Parse this person name:

Karen Alvarez (1761-1821, flourished 1781-1811)
user
first_name: Karen
last_name: Alvarez
middle_names: []
temporal:
- start: 1761
  end: 1821
  type: life_span
- start: 1781
  end: 1811
  type: flourished
titles: []
extra_info: []
assistant