What is the date for the grass surface final against Nathan Healey?
CREATE TABLE table_name_41 (
    date VARCHAR,
    surface VARCHAR,
    opponent_in_the_final VARCHAR
)
SELECT date FROM table_name_41 WHERE surface = "grass" AND opponent_in_the_final = "nathan healey"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the date for the grass surface final against Nathan Healey? ### Input: CREATE TABLE table_name_41 (
    date VARCHAR,
    surface VARCHAR,
    opponent_in_the_final VARCHAR
) ### Response: SELECT date FROM table_name_41 WHERE surface = "grass" AND opponent_in_the_final = "nathan healey"