Parse this person name:

Sierra Lawson, 1824-1868, flourished 1842-1860
user
first_name: Sierra
last_name: Lawson
middle_names: []
temporal:
- start: 1824
  end: 1868
  type: life_span
- start: 1842
  end: 1860
  type: flourished
titles: []
extra_info: []
assistant