VERIFIED SOLUTION i
Following are the steps to provide appropriate permission to the user:
1. Open Dialogue Admin and navigate to 'Database Instance' > 'User and Security' > 'Users'.
2. Double click on 'User Name' and navigate to 'Access rights' tab in the 'User Properties' window and select 'Allow user to log on to Visual Dialogue'. Click on 'OK'.
This allows the user to log on the Visual Dialogue but the user cannot change or create any object. User is able to create or edit a 'Selection' or 'Message Template' in Visual Dialogue if logon permission is granted to the user in Dialogue Admin.
UPDATED: November 30, 2018