Parse this person name:

Marga Wagenknecht (1764-1840, flourished 1780-1805)
user
first_name: Marga
last_name: Wagenknecht
middle_names: []
temporal:
- start: 1764
  end: 1840
  type: life_span
- start: 1780
  end: 1805
  type: flourished
titles: []
extra_info: []
assistant