Parse this person name:

Walther Stiffel (1868-1942, flourished 1898-1915)
user
first_name: Walther
last_name: Stiffel
middle_names: []
temporal:
- start: 1868
  end: 1942
  type: life_span
- start: 1898
  end: 1915
  type: flourished
titles: []
extra_info: []
assistant