Parse this person name:

Dex Jonker (1216-1291, flourished 1243-1267)
user
first_name: Dex
last_name: Jonker
middle_names: []
temporal:
- start: 1216
  end: 1291
  type: life_span
- start: 1243
  end: 1267
  type: flourished
titles: []
extra_info: []
assistant