Parse this person name:

Krista Nelson (1239-1316, flourished 1256-1267)
user
first_name: Krista
last_name: Nelson
middle_names: []
temporal:
- start: 1239
  end: 1316
  type: life_span
- start: 1256
  end: 1267
  type: flourished
titles: []
extra_info: []
assistant