Parse this person name:

Isaac Royer (1733-1804, flourished 1757-1781)
user
first_name: Isaac
last_name: Royer
middle_names: []
temporal:
- start: 1733
  end: 1804
  type: life_span
- start: 1757
  end: 1781
  type: flourished
titles: []
extra_info: []
assistant