Parse this person name:

William White (1720-1778, flourished 1738-1751)
user
first_name: William
last_name: White
middle_names: []
temporal:
- start: 1720
  end: 1778
  type: life_span
- start: 1738
  end: 1751
  type: flourished
titles: []
extra_info: []
assistant