Parse this person name:

Leif Fischer, 1605-1656, flourished 1633-1644
user
first_name: Leif
last_name: Fischer
middle_names: []
temporal:
- start: 1605
  end: 1656
  type: life_span
- start: 1633
  end: 1644
  type: flourished
titles: []
extra_info: []
assistant