Parse this person name:

Sienna Marchand (1740-1802, flourished 1763-1792)
user
first_name: Sienna
last_name: Marchand
middle_names: []
temporal:
- start: 1740
  end: 1802
  type: life_span
- start: 1763
  end: 1792
  type: flourished
titles: []
extra_info: []
assistant