Parse this person name:

Casper Speijer, 1366-1423, flourished 1387-1411
user
first_name: Casper
last_name: Speijer
middle_names: []
temporal:
- start: 1366
  end: 1423
  type: life_span
- start: 1387
  end: 1411
  type: flourished
titles: []
extra_info: []
assistant