Parse this person name:

Marvin Junken (1703-1757, flourished 1720-1747)
user
first_name: Marvin
last_name: Junken
middle_names: []
temporal:
- start: 1703
  end: 1757
  type: life_span
- start: 1720
  end: 1747
  type: flourished
titles: []
extra_info: []
assistant