Parse this person name:

Sylvia Spencer, 1328-1397, flourished 1353-1367
user
first_name: Sylvia
last_name: Spencer
middle_names: []
temporal:
- start: 1328
  end: 1397
  type: life_span
- start: 1353
  end: 1367
  type: flourished
titles: []
extra_info: []
assistant