If you are getting the Parse Error with the WP Travel Plugin in the file mentioned above in the title then the issue is most likely due to lower PHP version. It may be actually an incompatibility with PHP version 5.5, in your web server.
PHP stopped support for 5.5 in July 2016 and strongly recommend that it is not used due to security vulnerabilities – see here
Further, WordPress Requirements also recommends that the WordPress system config should be
PHP version 7.2 or greater which can read more about that here
So is case of such issue, it is strongly recommended to contact your Hosting Server providers to upgrade your PHP version to verify and resolve the issue.