Parse this person name:

Mark Margraf, 1749-1828, flourished 1771-1798
user
first_name: Mark
last_name: Margraf
middle_names: []
temporal:
- start: 1749
  end: 1828
  type: life_span
- start: 1771
  end: 1798
  type: flourished
titles: []
extra_info: []
assistant