Parse this person name:

Léon Chevallier, 1783-1849, flourished 1801-1812
user
first_name: Léon
last_name: Chevallier
middle_names: []
temporal:
- start: 1783
  end: 1849
  type: life_span
- start: 1801
  end: 1812
  type: flourished
titles: []
extra_info: []
assistant