Parse this person name:

Blanka Stiffel (1794-1871, flourished 1810-1820)
user
first_name: Blanka
last_name: Stiffel
middle_names: []
temporal:
- start: 1794
  end: 1871
  type: life_span
- start: 1810
  end: 1820
  type: flourished
titles: []
extra_info: []
assistant