What is the original air date of the episode directed by Ian Barry and written by Philip Dalkin?
CREATE TABLE table_18712423_3 (original_air_date VARCHAR, directed_by VARCHAR, written_by VARCHAR)
SELECT original_air_date FROM table_18712423_3 WHERE directed_by = "Ian Barry" AND written_by = "Philip Dalkin"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_18712423_3 (original_air_date VARCHAR, directed_by VARCHAR, written_by VARCHAR) Question: What is the original air date of the episode directed by Ian Barry and written by Philip Dalkin? [/INST] SELECT original_air_date FROM table_18712423_3 WHERE directed_by = "Ian Barry" AND written_by = "Philip Dalkin" </s>