The dialog is a condition that a server uses to request user input. Wire the OPC UA dialog condition refnum out output of the Dialog Condition instance of the Add Condition VI to the reference input of a standard Property Node to get a Dialog Condition Property Node. This Property Node has the following properties:

Property Description
Dialog State Whether a dialog is active and waiting for a response. Details
Enabled State Whether a condition is in the enabled state. Details
Prompt A dialog prompt to display to the end user. Details
Retain Whether an OPC UA client synchronizes the condition state with that of the server. Details