Parse this person name:

Gavin Townsend (1770-1820, flourished 1798-1815)
user
first_name: Gavin
last_name: Townsend
middle_names: []
temporal:
- start: 1770
  end: 1820
  type: life_span
- start: 1798
  end: 1815
  type: flourished
titles: []
extra_info: []
assistant