Parse this person name:

Léon Pelletier (1749-1798, flourished 1771-1789)
user
first_name: Léon
last_name: Pelletier
middle_names: []
temporal:
- start: 1749
  end: 1798
  type: life_span
- start: 1771
  end: 1789
  type: flourished
titles: []
extra_info: []
assistant