If you are not quite satisfied with the existing WP Travel plugin then the developer of the plugin has provided few template file that you can override as per your requirement.
Here are the steps that you can follow to override the template file of the plugin.
Step 1: Create the child theme of your current theme.
Step 2: Create the folder “wp-travel” in the child theme.
Step 3: Create the file within the folder “wp-travel” with the same name that you want to override.
Step 4: Finally you can override the file as per your requirement.
Note: The path that you need to follow to override the child theme is mentioned in the header of each template file.