Parse this person name:

Gundi Steinberg (1234-1307, flourished 1254-1274)
user
first_name: Gundi
last_name: Steinberg
middle_names: []
temporal:
- start: 1234
  end: 1307
  type: life_span
- start: 1254
  end: 1274
  type: flourished
titles: []
extra_info: []
assistant