let Timeframe = 90d;
AuditLogs
    | where TimeGenerated > ago(Timeframe)
    // Choose whether you want to focus on DissmissUser or ConfirmAccountCompromised operations
    //| where OperationName == "DismissUser"
    //| where OperationName == "ConfirmAccountCompromised"
    | extend SuspUser = tostring(TargetResources[0].displayName)
    // Add here the name of the user you want to focus on
    //| where SuspUser contains @""
    | extend SecUser = InitiatedBy.user.userPrincipalName
    // Add here the name of the security operator that confirmed account compromized
    //| where SecUser contains @""
    | project TimeGenerated, SuspUser, SecUser
    | sort by TimeGenerated desc