Parse this person name:

Gundel Geisel, 1798-1878, flourished 1821-1838
user
first_name: Gundel
last_name: Geisel
middle_names: []
temporal:
- start: 1798
  end: 1878
  type: life_span
- start: 1821
  end: 1838
  type: flourished
titles: []
extra_info: []
assistant