Parse this person name:

Sarah Walker (1764-1839, flourished 1786-1803)
user
first_name: Sarah
last_name: Walker
middle_names: []
temporal:
- start: 1764
  end: 1839
  type: life_span
- start: 1786
  end: 1803
  type: flourished
titles: []
extra_info: []
assistant