Parse this person name:

Leah Geerling (1839-1918, flourished 1854-1878)
user
first_name: Leah
last_name: Geerling
middle_names: []
temporal:
- start: 1839
  end: 1918
  type: life_span
- start: 1854
  end: 1878
  type: flourished
titles: []
extra_info: []
assistant