Parse this person name:

William Lawson, 1778-1840, flourished 1795-1821
user
first_name: William
last_name: Lawson
middle_names: []
temporal:
- start: 1778
  end: 1840
  type: life_span
- start: 1795
  end: 1821
  type: flourished
titles: []
extra_info: []
assistant