Parse this person name:

Sepp Keltenie, 1907-1957, flourished 1931-1948
user
first_name: Sepp
last_name: Keltenie
middle_names: []
temporal:
- start: 1907
  end: 1957
  type: life_span
- start: 1931
  end: 1948
  type: flourished
titles: []
extra_info: []
assistant