Parse this person name:

Emily Stephens (1250-1291, flourished 1280-1286)
user
first_name: Emily
last_name: Stephens
middle_names: []
temporal:
- start: 1250
  end: 1291
  type: life_span
- start: 1280
  end: 1286
  type: flourished
titles: []
extra_info: []
assistant