Changing Environment Field Automatically In Report

I have an Access database (.accdb) that has table, form and report. The field in all are the same. The user interacts with the Form only and enters data to it. Table is a back-end thing and no-one goes to it. However, in Form there is a button that when pressed, prints the report for that relevant form/record which we then give to customers.

Now, I have a field in report (like a signature field) that mentions the name of the user who printed that report. Lets say, Mr X did the data entry and then printed the report and gave it to the customer. After that customer loses the report and comes back for a copy of the report, but now Mr Y is at the desk and issues the report. Obviously Mr Y doesn't have to do the data entry again because record is there and Mr Y has the access to it, so he just presses the print report button and prints the report. What I would like is that the signature field should update itself if anyone else (in this case Mr Y) accesses the database and prints the report for that specific record.