Parse this person name:

Justin Williams, 1203-1259, flourished 1220-1250
user
first_name: Justin
last_name: Williams
middle_names: []
temporal:
- start: 1203
  end: 1259
  type: life_span
- start: 1220
  end: 1250
  type: flourished
titles: []
extra_info: []
assistant