Parse this person name:

Jet van de Elzas, 1254-1334, flourished 1276-1294
user
first_name: Jet
last_name: van de Elzas
middle_names: []
temporal:
- start: 1254
  end: 1334
  type: life_span
- start: 1276
  end: 1294
  type: flourished
titles: []
extra_info: []
assistant