Parse this person name:

Alec Robertson (1823-1891, flourished 1851-1866)
user
first_name: Alec
last_name: Robertson
middle_names: []
temporal:
- start: 1823
  end: 1891
  type: life_span
- start: 1851
  end: 1866
  type: flourished
titles: []
extra_info: []
assistant