Parse this person name:

Friedhelm Käster (1745-1803, flourished 1772-1793)
user
first_name: Friedhelm
last_name: Käster
middle_names: []
temporal:
- start: 1745
  end: 1803
  type: life_span
- start: 1772
  end: 1793
  type: flourished
titles: []
extra_info: []
assistant