Parse this person name:

Alexander van Dongen (1712-1778, flourished 1731-1760)
user
first_name: Alexander
last_name: van Dongen
middle_names: []
temporal:
- start: 1712
  end: 1778
  type: life_span
- start: 1731
  end: 1760
  type: flourished
titles: []
extra_info: []
assistant