Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE customers_policies ( date_opened VARCHAR, date_closed VARCHAR, customer_id VARCHAR )
TABLE: CREATE TABLE customers ( customer_id VARCHAR, customer_name VARCHAR )

### Question ###
Retrieve the open and close dates of all the policies associated with the customer whose name contains 'Diana

### Accurate SQL ###

SELECT t2.date_opened, t2.date_closed FROM customers AS t1 JOIN customers_policies AS t2 ON t1.customer_id = t2.customer_id WHERE t1.customer_name LIKE "%Diana%"