Parse this person name:

Casper Lether, 1942-2017, flourished 1958-1978
user
first_name: Casper
last_name: Lether
middle_names: []
temporal:
- start: 1942
  end: 2017
  type: life_span
- start: 1958
  end: 1978
  type: flourished
titles: []
extra_info: []
assistant