Parse this person name:

Siem Serra (1204-1247, flourished 1231-1242)
user
first_name: Siem
last_name: Serra
middle_names: []
temporal:
- start: 1204
  end: 1247
  type: life_span
- start: 1231
  end: 1242
  type: flourished
titles: []
extra_info: []
assistant