I would avoid showing your result to the users, as it may bias them. Then, they would be prone to confirming your assumptions, just because they:
- Think you are a specialist, and you're more competent than them (mostly if they don't fully grasp the journey/process or do it very rarely/long ago)
- Don't want you to feel bad (mostly with emphatic people, and in cases where your error isn't a huge one)
- Don't fully understand the concept/way of your presentation of user journey, so they don't feel confident speaking against it, not to look like a fool
- Any many others..
Either way, what I suggest to you is that you do a workshop with them. Be their host and guide them to create the user journey themselves.
Then, when you have their output, you use it to validate your ideas and might do a cross-checking interviews afterwards, asking the users about the details. For example:
Have you ever, when at the airport (let's say it was the environment of the user journey) had trouble with finding your gate? (the element ommitted by the user, that was in your user journey)
How to make a customer journey workshop?
- Prepare several big paper sheets, post-its and markers
- Ask a group of users to list all the steps that make up the journey, so get them from a point A to B
- Ask them to arrange them on top of the paper (or several glued one) horizontally, in one swimlane, in order
- Below, in second swimlane, ask them to mark only these steps, that they feel are crucial/give them the most trouble
- Third swimlane, should be a bit taller and include their general feeling regarding the step, how are they feeling during the activity X? Ask them to draw a face with the corresponding feeling on a post-it and put it under each activity. For example: Waiting in a queue -> [ :| Bored ]. Ask them to put the post-its higher or lower in the swimlane, depending on how positive/negative the feeling is. Draw lines between each post-it, forming a graph.
- Last swimlane, should adress the feelings/problems at the each step. Ask users, what do they think would actually help them in that specific moment? Spend the most time on the tasks marked as important (2nd swimlane) or with very negative associated emotion.
The two bottom swimlanes could look something like this (obviously with stickers, visuals are not important here, just grasping the idea):
Image from: https://www.pinterest.com/robertleotta/user-journeys/
Remember, this is just one of the ways to conduct User Journey workshop. There are many more ways to do that. You can change the scenario depending on what information you need. Here you will gain a high overview of the journey and some (maybe) unexpected insights.