Parse this person name:

Dex Oostveen, 1358-1420, flourished 1381-1400
user
first_name: Dex
last_name: Oostveen
middle_names: []
temporal:
- start: 1358
  end: 1420
  type: life_span
- start: 1381
  end: 1400
  type: flourished
titles: []
extra_info: []
assistant