Parse this person name:

Ruben Kriens, 1340-1389, flourished 1366-1384
user
first_name: Ruben
last_name: Kriens
middle_names: []
temporal:
- start: 1340
  end: 1389
  type: life_span
- start: 1366
  end: 1384
  type: flourished
titles: []
extra_info: []
assistant