Parse this person name:

Robert Johnson (1257-1304, flourished 1277-1297)
user
first_name: Robert
last_name: Johnson
middle_names: []
temporal:
- start: 1257
  end: 1304
  type: life_span
- start: 1277
  end: 1297
  type: flourished
titles: []
extra_info: []
assistant