user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Who shot the United States Ambassador to Lesotho? 
Knowledge Triplets: Attempted assassination of Ronald Reagan, base.culturalevent.event.entity_involved, John Hinckley Jr.
John Hinckley, Jr., film.film_character.portrayed_in_films, m.0cl6z0s
Walt Dickson, people.deceased_person.place_of_death, Ardmore
United States Ambassador to Lesotho, government.government_office_or_title.office_holders, m.0tl6mf5
John Hinckley Jr., people.person.place_of_birth, Ardmore
m.04hx0xv, education.education.student, John Hinckley Jr.
Government Office or Title, type.type.domain, Government
Government Office or Title, type.type.expected_by, Offices
m.05nn8w5, education.education.student, John Hinckley Jr.
Charles D. Carter, people.deceased_person.place_of_death, Ardmore
Ardmore, location.location.contains, Black Theater of Ardmore
Shirley Abbott, government.politician.government_positions_held, m.0tl6lrw
Ardmore, location.location.containedby, Oklahoma
United States Department of State, government.governmental_body.members, m.0tl6lrw
m.04dwnw8, base.prison.imprisonment.prisoner, John Hinckley Jr.
John Hinckley Jr., user.avh.default_domain.ellerdale_topic.ellerdale_id, 009a-0e58
m.05nn8w5, education.education.institution, Highland Park High School
Oklahoma, location.location.contains, Ardmore
Government Office or Title, freebase.type_profile.kind, Definition
June Carter Perry, common.image.appears_in_topic_gallery, United States Ambassador to Lesotho
Government Office or Title, type.type.expected_by, Office, position, or title
Ardmore, location.location.containedby, Carter County
Washington Hilton, location.location.events, Attempted assassination of Ronald Reagan
Government Office or Title, freebase.type_profile.published, Published
John Hinckley, Jr., fictional_universe.fictional_character.based_on, John Hinckley Jr.
Government Office or Title, freebase.type_profile.strict_included_types, Abstract
John Hinckley Jr., people.person.date_of_birth, 1955-05-29
John Hinckley Jr., nytimes.topic.uri, top$002Freference$002Ftimestopics$002Fpeople$002Fh$002Fjohn_w_jr_hinckley
United States Ambassador to Lesotho, common.topic.notable_for, g.125618_71
m.0tl6lrw, government.government_position_held.governmental_body, United States Department of State
Government Office or Title, type.type.expected_by, Title of Chief Executive
Government Office or Title, freebase.type_profile.strict_included_types, Topic
Ardmore, location.location.contains, Southern Oklahoma Technology Center
Male, fictional_universe.character_gender.characters_of_this_gender, John Hinckley Jr.
Robert B. Nolan, government.politician.government_positions_held, m.0tl6mf5
Black Theater of Ardmore, location.location.containedby, Ardmore
Office, position, or title, owl#inverseOf, Office Holders
m.0tl6lrw, government.government_position_held.appointed_by, Ronald Reagan
Government Office or Title, type.type.properties, Governmental body (if any)
m.0ggd227, common.webpage.topic, United States Ambassador to Lesotho
m.0tl6mf5, government.government_position_held.office_position_or_title, United States Ambassador to Lesotho
Government Office or Title, type.type.expected_by, Offices/Positions Within the Body
Dornick Hills Country Club, location.location.containedby, Ardmore
Ardmore, location.location.people_born_here, John Hinckley Jr.
Michele Thoren Bond ambassador, common.image.appears_in_topic_gallery, United States Ambassador to Lesotho
m.0ztjrhk, dataworld.gardening_hint.last_referenced_by, John Hinckley Jr.
Ronald Reagan, user.dfhuynh.default_domain.assassinated_person.assassination, m.04g55sc
m.04g55sc, user.dfhuynh.default_domain.assassination.assassin, John Hinckley Jr.
m.0n0y9rk, education.education.institution, University Yale
Ronald Reagan, government.political_appointer.appointees, m.0tl6lrw
United States Ambassador to Lesotho, common.topic.webpage, m.0gx7951
m.0gx7951, common.webpage.topic, United States Ambassador to Lesotho
m.04hx0xv, education.education.institution, Texas Tech University
m.0tl6mf5, government.government_position_held.office_holder, Robert B. Nolan
United States Ambassador to Lesotho, common.topic.article, m.027c0bh
United States Ambassador to Lesotho, common.topic.webpage, m.0ggd227
John Hinckley Jr., fictional_universe.person_in_fiction.representations_in_fiction, John Hinckley, Jr.
m.0tl6lrw, government.government_position_held.basic_title, Ambassador
William M. Dalton, people.deceased_person.place_of_death, Ardmore
Southern Oklahoma Technology Center, location.location.containedby, Ardmore
United States Ambassador to Lesotho, common.topic.image, Michele Thoren Bond ambassador
Ronald Reagan, user.dfhuynh.default_domain.assassinated_person.assassination, m.04g55sc
m.0n0y9rk, education.education.student, John Hinckley Jr.
Michele Thoren Bond ambassador, common.image.size, m.02d3p6n
United States Ambassador to Lesotho, government.government_office_or_title.office_holders, m.0tl6lrw
Constantine B. Kilgore, people.deceased_person.place_of_death, Ardmore
Government Office or Title, type.type.properties, Office Holders
United States Ambassador to Lesotho, common.topic.image, June Carter Perry
m.04g55sc, user.dfhuynh.default_domain.assassination.method, Gun
Ardmore, location.location.area, 134.1
m.04g55sc, user.dfhuynh.default_domain.assassination.location, Washington, D.C.
Government Office or Title, freebase.type_profile.strict_included_types, Non-Agent
Government Office or Title, type.type.expected_by, Office, Position, or Title
Government Office or Title, common.topic.article, m.02xlj1v
Ambassador, government.government_office_category.officeholders, m.0tl6lrw
m.04g55sc, user.dfhuynh.default_domain.assassination.assassin, John Hinckley Jr.
m.04g55sc, user.dfhuynh.default_domain.assassination.outcome, Failure
m.0cl6z0s, film.performance.character, John Hinckley, Jr.
John Hinckley Jr., people.person.education, m.05nn8w5
Office, position, or title, rdf-schema#range, Government Office or Title
m.04g55sc, user.dfhuynh.default_domain.assassination.date, 1981-03-30
Office, position, or title, type.property.expected_type, Government Office or Title
June Carter Perry, common.image.size, m.0kjlb9
m.0tl6lrw, government.government_position_held.office_holder, Shirley Abbott
John Hinckley Jr., people.person.gender, Male
John Hinckley Jr., people.person.education, m.0n0y9rk
m.0tl6lrw, government.government_position_held.office_position_or_title, United States Ambassador to Lesotho
Ardmore, location.location.contains, Dornick Hills Country Club
Government Office or Title, type.type.expected_by, Government positions
Government Office or Title, type.type.properties, Jurisdiction
Washington, D.C., location.location.events, Attempted assassination of Ronald Reagan
John Hinckley Jr., fictional_universe.fictional_character.gender, Male
Government Office or Title, freebase.type_hints.included_types, Topic
John Hinckley Jr., people.person.education, m.04hx0xv
Office, position, or title, type.property.reverse_property, Office Holders
m.04g55sc, user.dfhuynh.default_domain.assassination.assassinated_person, Ronald Reagan
Government Office or Title, type.type.expected_by, Office
United States Ambassador to Lesotho, government.government_office_or_title.office_holders, m.0tl6lrw
Topic, freebase.type_profile.published, Published
John Hinckley Jr., base.prison.prisoner.imprisoned, m.04dwnw8
Government Office or Title, type.type.properties, Category
United States Ambassador to Lesotho, common.topic.notable_types, Government Office or Title
Carter County, location.location.contains, Ardmore
m.0tl6lrw, government.political_appointer.appointees, Ronald Reagan
KVSO, broadcast.broadcast.area_served, Ardmore

Answer: John Hinckley Jr.