diff --git a/lib/actions/user.js b/lib/actions/user.js
index <HASH>..<HASH> 100644
--- a/lib/actions/user.js
+++ b/lib/actions/user.js
@@ -298,7 +298,7 @@ export function verifyPhoneNumber (code) {
 }
 
 /**
- * Check itinerary availability (existence) for the given monitored trip.
+ * Check itinerary existence for the given monitored trip.
  */
 export function checkItineraryExistence (trip) {
   return async function (dispatch, getState) {
@@ -315,7 +315,7 @@ export function checkItineraryExistence (trip) {
     if (status === 'success' && data) {
       dispatch(setitineraryExistence(data))
     } else {
-      alert('Error checking the availability of your selected trip.')
+      alert('Error checking whether your selected trip is possible.')
     }
   }
 }
refactor(actions/user): Twaek comment/error msg for itinerary check.