Parse this person name:

Bertha Koch (1947-2006, flourished 1969-1990)
user
first_name: Bertha
last_name: Koch
middle_names: []
temporal:
- start: 1947
  end: 2006
  type: life_span
- start: 1969
  end: 1990
  type: flourished
titles: []
extra_info: []
assistant