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 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?

### Accurate SQL ###

SELECT original_air_date FROM table_18712423_3 WHERE directed_by = "Ian Barry" AND written_by = "Philip Dalkin"