How to write script in flow designer.

[chandan31]

var ab= fd_data.trigger.current.subject_person;

var number = fd_data.trigger.current.sys_id;

var cd= fd_data.trigger.current.subject_person.manager;

var url = '<a href="' + gs.getProperty('glide.servlet.uri') + '/esc?id=ticket&is_new_order=true&table=sn_hr_core_case_workforce_admin&sys_id>' + number + '</a>'

var test="Dear" +ab +<br>+cd "has requested Long Term Care Leave. Review this request and select one of the options below and click Mark as complete. You can review the request by clicking '[code]'+url+'[code]'. In the tab 'Additional Details' you can find the content of the request. Under the tab 'Attachment' you can find uploaded documents, in case documents have been uploaded";

return test;

@asifnoor : please help sir