Parse this person name:

Sienna Ehlert (1430-1498, flourished 1446-1469)
user
first_name: Sienna
last_name: Ehlert
middle_names: []
temporal:
- start: 1430
  end: 1498
  type: life_span
- start: 1446
  end: 1469
  type: flourished
titles: []
extra_info: []
assistant