ivy-sample.el

(defun say-hello ()
  (interactive)
  (message "hello"))

(defun say-goodbye ()
  (interactive)
  (message "good bye"))

(defun say-something ()
  (interactive)
  (ivy-read "what would you like to say? : "
            '("hello" "goodbye")
            :action
            (lambda (x)
              (cond
               ((string= x "hello")   (say-hello))
               ((string= x "goodbye") (say-goodbye))
               (t                     (message "no match"))))))