Parse this person name:

Richard Käster, 1829-1874, flourished 1851-1866
user
first_name: Richard
last_name: Käster
middle_names: []
temporal:
- start: 1829
  end: 1874
  type: life_span
- start: 1851
  end: 1866
  type: flourished
titles: []
extra_info: []
assistant