Parse this person name:

Gretchen Eimer (1238-1305, flourished 1257-1275)
user
first_name: Gretchen
last_name: Eimer
middle_names: []
temporal:
- start: 1238
  end: 1305
  type: life_span
- start: 1257
  end: 1275
  type: flourished
titles: []
extra_info: []
assistant