Active Administrator does not officially support integration with the third-party application ServiceNow. However, if the trigger to create a ticket is based on an email notification, Active Administrator should be able to send email notifications from a specific alert to a specific email recipient, but that is as far as it could get. You can find more information in the following technical documentation topics:
Setting notification options:
https://support.quest.com/technical-documents/active-administrator/8.5/user-guide/84#TOPIC-1358204
Managing email addresses:
https://support.quest.com/technical-documents/active-administrator/8.5/user-guide/92#TOPIC-1358235