Thank you all for your replay.
I am going to plan a job that will read the user's account attribute DirXML-PasswordSyncStatus and if the job finds anything different than [B]"User %cn% has changed : Password Change Successful"[/B], or I can create a new attribute "Enforce PassSync?" to be updated through LDAP browser (to be used only by Service Desk's operators) to created a enforced PassSync event when they receive a call from end users. In both cases an event will be started to sync down the user's password.
I hope it gonna works