Parse this person name:

Birgitt Gierschner (1668-1741, flourished 1698-1722)
user
first_name: Birgitt
last_name: Gierschner
middle_names: []
temporal:
- start: 1668
  end: 1741
  type: life_span
- start: 1698
  end: 1722
  type: flourished
titles: []
extra_info: []
assistant