Parse this person name:

Ottmar Johann (1439-1494, flourished 1457-1477)
user
first_name: Ottmar
last_name: Johann
middle_names: []
temporal:
- start: 1439
  end: 1494
  type: life_span
- start: 1457
  end: 1477
  type: flourished
titles: []
extra_info: []
assistant