Parse this person name:

Christopher Walton (1493-1573, flourished 1519-1543)
user
first_name: Christopher
last_name: Walton
middle_names: []
temporal:
- start: 1493
  end: 1573
  type: life_span
- start: 1519
  end: 1543
  type: flourished
titles: []
extra_info: []
assistant