Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15070195_1 (date_completed VARCHAR, nickname VARCHAR)
### Question:
when the nickname halley is used, what are the date completed
### Answer:
SELECT date_completed FROM table_15070195_1 WHERE nickname = "Halley"