Parse this person name:

Denis Denis (1921-1971, flourished 1945-1955)
user
first_name: Denis
last_name: Denis
middle_names: []
temporal:
- start: 1921
  end: 1971
  type: life_span
- start: 1945
  end: 1955
  type: flourished
titles: []
extra_info: []
assistant