Parse this person name:

Bernard Dumas (1761-1828, flourished 1778-1808)
user
first_name: Bernard
last_name: Dumas
middle_names: []
temporal:
- start: 1761
  end: 1828
  type: life_span
- start: 1778
  end: 1808
  type: flourished
titles: []
extra_info: []
assistant