Parse this person name:

Jennifer Seifert (1219-1274, flourished 1236-1249)
user
first_name: Jennifer
last_name: Seifert
middle_names: []
temporal:
- start: 1219
  end: 1274
  type: life_span
- start: 1236
  end: 1249
  type: flourished
titles: []
extra_info: []
assistant