Parse this person name:

Christopher Robertson, 1679-1733, flourished 1706-1728
user
first_name: Christopher
last_name: Robertson
middle_names: []
temporal:
- start: 1679
  end: 1733
  type: life_span
- start: 1706
  end: 1728
  type: flourished
titles: []
extra_info: []
assistant