Parse this person name:

Margaret Keith (1931-2009, flourished 1954-1984)
user
first_name: Margaret
last_name: Keith
middle_names: []
temporal:
- start: 1931
  end: 2009
  type: life_span
- start: 1954
  end: 1984
  type: flourished
titles: []
extra_info: []
assistant