How can I update the Actual Close Date with the actual date value entered in the dialog box?

Hi,

I am using Dynamic CRM 2015 - On-Premises. I have a custom dialog box that opens on click of 'Close As Won' in opportunity form.

In the dialog box, I prompt the user to enter the Actual Close Date (date field). I update the Actual Close Date using {Response Text(Select Close Date)} in Opportunity entity in the dialog.

The issue is that the Actual Close Date always remains the current date, even if I select a future date

How can I update the Actual Close Date with the actual date value entered in the dialog box?

Your reply will be greatly appreciated.