Parse this person name:

Gustav Hettner (1280-1359, flourished 1297-1323)
user
first_name: Gustav
last_name: Hettner
middle_names: []
temporal:
- start: 1280
  end: 1359
  type: life_span
- start: 1297
  end: 1323
  type: flourished
titles: []
extra_info: []
assistant