Parse this person name:

Brian Duncan, 1780-1844, flourished 1808-1835
user
first_name: Brian
last_name: Duncan
middle_names: []
temporal:
- start: 1780
  end: 1844
  type: life_span
- start: 1808
  end: 1835
  type: flourished
titles: []
extra_info: []
assistant