Parse this person name:

William Contreras (1739-1804, flourished 1759-1786)
user
first_name: William
last_name: Contreras
middle_names: []
temporal:
- start: 1739
  end: 1804
  type: life_span
- start: 1759
  end: 1786
  type: flourished
titles: []
extra_info: []
assistant