(DEFINE-RULE GREETING
  (PATTERN (HELLO))
  (RESPONSE (HELLO! HOW CAN I HELP YOU?)))

(DEFINE-RULE FAREWELL
  (PATTERN (GOODBYE))
  (RESPONSE (GOODBYE! HAVE A NICE DAY!)))

(DEFINE-RULE ASK-NAME
  (PATTERN (WHAT IS YOUR NAME))
  (RESPONSE (I AM QA-4, A QUESTION ANSWERING SYSTEM)))