Parse this person name:

Dionigi Cassarà (1227-1276, flourished 1255-1271)
user
first_name: Dionigi
last_name: Cassarà
middle_names: []
temporal:
- start: 1227
  end: 1276
  type: life_span
- start: 1255
  end: 1271
  type: flourished
titles: []
extra_info: []
assistant