Add message to the WooCommerce cart page.

functions.php

/**
 * Add message to the cart page.
 * Created at : 17 Dec 2018
 * Updated at : 17 Dec 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 * Gist Link : https://gist.github.com/varun-pluginhive/9938137d3a7f8e6b910109267f61e88f
 */
add_action( 'woocommerce_init', function(){
	$message = "Please proceed to the Checkout page to get the UPS AccessPoint option as delivery option.";		// Provide the message
	$request_url = $_SERVER['REQUEST_URI'];
	if(is_cart() || strpos( $request_url, 'cart' ) !== false )
		wc_add_notice($message);
});