Parse this person name:

Amber van 't Riet (1229-1292, flourished 1244-1264)
user
first_name: Amber
last_name: van 't Riet
middle_names: []
temporal:
- start: 1229
  end: 1292
  type: life_span
- start: 1244
  end: 1264
  type: flourished
titles: []
extra_info: []
assistant