Parse this person name:

Stacy Keller, 1218-1260, flourished 1246-1255
user
first_name: Stacy
last_name: Keller
middle_names: []
temporal:
- start: 1218
  end: 1260
  type: life_span
- start: 1246
  end: 1255
  type: flourished
titles: []
extra_info: []
assistant