Parse this person name:

James Walker (1420-1460, flourished 1450-1455)
user
first_name: James
last_name: Walker
middle_names: []
temporal:
- start: 1420
  end: 1460
  type: life_span
- start: 1450
  end: 1455
  type: flourished
titles: []
extra_info: []
assistant