Parse this person name:

Johann Hettner (1801-1858, flourished 1827-1846)
user
first_name: Johann
last_name: Hettner
middle_names: []
temporal:
- start: 1801
  end: 1858
  type: life_span
- start: 1827
  end: 1846
  type: flourished
titles: []
extra_info: []
assistant