Parse this person name:

Helena Kas, 1360-1431, flourished 1376-1398
user
first_name: Helena
last_name: Kas
middle_names: []
temporal:
- start: 1360
  end: 1431
  type: life_span
- start: 1376
  end: 1398
  type: flourished
titles: []
extra_info: []
assistant