Parse this person name:

Milena Speer, 1812-1878, flourished 1838-1860
user
first_name: Milena
last_name: Speer
middle_names: []
temporal:
- start: 1812
  end: 1878
  type: life_span
- start: 1838
  end: 1860
  type: flourished
titles: []
extra_info: []
assistant