Parse this person name:

Benjamin Roger, 1225-1284, flourished 1251-1270
user
first_name: Benjamin
last_name: Roger
middle_names: []
temporal:
- start: 1225
  end: 1284
  type: life_span
- start: 1251
  end: 1270
  type: flourished
titles: []
extra_info: []
assistant