Parse this person name:

David Butler, 1439-1518, flourished 1454-1470
user
first_name: David
last_name: Butler
middle_names: []
temporal:
- start: 1439
  end: 1518
  type: life_span
- start: 1454
  end: 1470
  type: flourished
titles: []
extra_info: []
assistant