Parse this person name:

Cosima Jäntsch, 1351-1404, flourished 1369-1391
user
first_name: Cosima
last_name: Jäntsch
middle_names: []
temporal:
- start: 1351
  end: 1404
  type: life_span
- start: 1369
  end: 1391
  type: flourished
titles: []
extra_info: []
assistant