Parse this person name:

Walther Flantz (1635-1684, flourished 1651-1669)
user
first_name: Walther
last_name: Flantz
middle_names: []
temporal:
- start: 1635
  end: 1684
  type: life_span
- start: 1651
  end: 1669
  type: flourished
titles: []
extra_info: []
assistant