[User] List all staff members who have responded to at least one review in the last 6 months, including their first and last names and the count of responses.

[Assistant]
SELECT s.staff_id, s.first_name, s.last_name, COUNT(r.review_id) AS response_count
FROM hospitality_technology.reviews AS r
JOIN hospitality_technology.staff AS s
  ON r.response_staff_id = s.staff_id
WHERE r.response_date >= CURRENT_DATE - INTERVAL '6 months'
GROUP BY s.staff_id, s.first_name, s.last_name;

[User] Actually, only include responses to public reviews.

[Assistant]
SELECT s.staff_id, s.first_name, s.last_name, COUNT(r.review_id) AS response_count
FROM hospitality_technology.reviews AS r
JOIN hospitality_technology.staff AS s
  ON r.response_staff_id = s.staff_id
WHERE r.response_date >= CURRENT_DATE - INTERVAL '6 months'
  AND r.is_public = TRUE
GROUP BY s.staff_id, s.first_name, s.last_name;

[User] Also include the average response time in days for each staff member.

[Assistant]
SELECT s.staff_id, s.first_name, s.last_name,
       COUNT(r.review_id) AS response_count,
       AVG(EXTRACT(EPOCH FROM (r.response_date - r.review_date)) / 86400) AS avg_response_days
FROM hospitality_technology.reviews AS r
JOIN hospitality_technology.staff AS s
  ON r.response_staff_id = s.staff_id
WHERE r.response_date >= CURRENT_DATE - INTERVAL '6 months'
  AND r.is_public = TRUE
GROUP BY s.staff_id, s.first_name, s.last_name;

System:
You are an SQL statement expert. Given the table structure described by the CREATE TABLE statement, write an SQL query that provides the solution to the user's question.
##Table Structure
CREATE TABLE hospitality_technology.properties (
    property_id character varying(64) NOT NULL,  -- unique identifier for the property (hotel, resort, etc.)
    property_name character varying(255) NOT NULL, -- name of the property
    address_line1 character varying(255) NOT NULL, -- primary address line
    address_line2 character varying(255), -- secondary address line
    city character varying(100) NOT NULL, -- city
    state_province character varying(100), -- state or province
    postal_code character varying(20) NOT NULL, -- zip or postal code
    country_code character varying(3) NOT NULL, -- ISO country code (e.g., USA, CAN)
    phone_number character varying(30), -- main contact phone
    email_address character varying(255), -- main contact email
    property_type character varying(50) NOT NULL, -- e.g., Hotel, Resort, B&B, Motel
    star_rating numeric(2,1), -- star rating (e.g., 4.5)
    timezone character varying(64) NOT NULL, -- IANA timezone ID (e.g., America/New_York)
    manager_staff_id character varying(64), -- FK to staff table for the general manager
    created_at timestamp with time zone NOT NULL DEFAULT current_timestamp, -- record creation time
    updated_at timestamp with time zone NOT NULL DEFAULT current_timestamp, -- record last update time
    PRIMARY KEY (property_id)
)
CREATE TABLE hospitality_technology.staff ( staff_id text PRIMARY KEY, property_id text, first_name text, last_name text, position text, work_email text, work_phone text, hire_date date, termination_date date, is_active boolean, access_level int, manager_id text, created_at timestamp )
CREATE TABLE hospitality_technology.service_orders ( order_id text PRIMARY KEY, reservation_id text, guest_id text, service_id text, staff_id_ordered text, staff_id_delivered text, order_timestamp timestamp, delivery_timestamp timestamp, quantity int, unit_price numeric, total_price numeric, status text, notes text, bill_id text )
CREATE TABLE hospitality_technology.reviews ( review_id text, property_id text, reservation_id text, guest_id text, rating_overall integer, rating_cleanliness integer, rating_service integer, rating_location integer, rating_value integer, comment text, review_source text, review_date timestamp, is_public boolean, staff_response text, response_staff_id text, response_date timestamp )