Please update your forum profile with a real handle instead of "981911". Always state which APEX version you are using when asking a question.
Include P21_TICKETNUMBER in the Region Definition > Source > Page Items to Submit property in the report region definition. The item value will then be submitted and stored in session state when the report is refreshed.
Create a Dynamic Action to refresh the report region when the Find button is clicked.
Thank you for your reply. Though it did not fully resolve my problem, you did point me in the right direction and I was eventually able to find a solution.