Parse this person name:

Henry Seifert, 1881-1956, flourished 1911-1931
user
first_name: Henry
last_name: Seifert
middle_names: []
temporal:
- start: 1881
  end: 1956
  type: life_span
- start: 1911
  end: 1931
  type: flourished
titles: []
extra_info: []
assistant