Parse this person name:

Siem Feltzer, 1869-1947, flourished 1892-1919
user
first_name: Siem
last_name: Feltzer
middle_names: []
temporal:
- start: 1869
  end: 1947
  type: life_span
- start: 1892
  end: 1919
  type: flourished
titles: []
extra_info: []
assistant