Parse this person name:

Alex Giselmeyer (1803-1850, flourished 1826-1845)
user
first_name: Alex
last_name: Giselmeyer
middle_names: []
temporal:
- start: 1803
  end: 1850
  type: life_span
- start: 1826
  end: 1845
  type: flourished
titles: []
extra_info: []
assistant