Parse this person name:

John Becker (1420-1463, flourished 1435-1450)
user
first_name: John
last_name: Becker
middle_names: []
temporal:
- start: 1420
  end: 1463
  type: life_span
- start: 1435
  end: 1450
  type: flourished
titles: []
extra_info: []
assistant