Parse this person name:

Ralf Kranz (1743-1808, flourished 1759-1776)
user
first_name: Ralf
last_name: Kranz
middle_names: []
temporal:
- start: 1743
  end: 1808
  type: life_span
- start: 1759
  end: 1776
  type: flourished
titles: []
extra_info: []
assistant