Parse this person name:

Gereon Kühnert, 1774-1828, flourished 1791-1820
user
first_name: Gereon
last_name: Kühnert
middle_names: []
temporal:
- start: 1774
  end: 1828
  type: life_span
- start: 1791
  end: 1820
  type: flourished
titles: []
extra_info: []
assistant