Parse this person name:

Elena Stettyn (1740-1804, flourished 1770-1799)
user
first_name: Elena
last_name: Stettyn
middle_names: []
temporal:
- start: 1740
  end: 1804
  type: life_span
- start: 1770
  end: 1799
  type: flourished
titles: []
extra_info: []
assistant