Which design pattern should be used for custom forms reporting?

We have custom forms consist of questions and answers which can be dynamically added. So the data is stored in rows of tables in database. Now the requirements are:

1) Generate report of data in single row. All questions and answers of a form should appear in one row. 2) Some customers wants to manipulate data in their provided scheme while generating report e.g. Show additional system information along with custom form data and conditional checks on dependent questions. 3) Report can be extracted in excel, pdf etc. Moreover there should be a functionality to zip excel or pdf file if multiple reports are to be generated.