Parse this person name:

Kelsey Page (1387-1450, flourished 1411-1437)
user
first_name: Kelsey
last_name: Page
middle_names: []
temporal:
- start: 1387
  end: 1450
  type: life_span
- start: 1411
  end: 1437
  type: flourished
titles: []
extra_info: []
assistant