Parse this person name:

Sibel Gnatz-Berger, 1836-1888, flourished 1851-1881
user
first_name: Sibel
last_name: Gnatz-Berger
middle_names: []
temporal:
- start: 1836
  end: 1888
  type: life_span
- start: 1851
  end: 1881
  type: flourished
titles: []
extra_info: []
assistant