Parse this person name:

Spencer Johnson, 1240-1295, flourished 1270-1286
user
first_name: Spencer
last_name: Johnson
middle_names: []
temporal:
- start: 1240
  end: 1295
  type: life_span
- start: 1270
  end: 1286
  type: flourished
titles: []
extra_info: []
assistant