15:40:47.129 (129957383)|USER_DEBUG|[77]|DEBUG|CSV:(Ticket__c:{First_Name__c=Mar, Last_Name__c=Roxas, Email_Address__c=maro@gmail.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=Grace, Last_Name__c=Poe, Email_Address__c=gripo@yahoomail.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=Jejomar, Last_Name__c=Binay, Email_Address__c=jomay@hotmail.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=Rodrigo, Last_Name__c=Duterte, Email_Address__c=thirtythree@alphasys.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=Melai, Last_Name__c=Hontiveros, Email_Address__c=melai@gmail.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=John, Last_Name__c=Lazy, Email_Address__c=john.lazy@gmail.com
, Status__c=Attended, Type__c=Non-Ticketed}, Ticket__c:{First_Name__c=Vicmar, Last_Name__c=Dahalili, Email_Address__c=vicdahalili@hotmail.com
, Status__c=Attended, Type__c=Non-Ticketed})

15:40:47.130 (130466282)|USER_DEBUG|[88]|DEBUG|Update Ticket: (Ticket__c:{Id=a0d9000000Bz3QCAAZ, First_Name__c=Melai, Last_Name__c=Hontiveros, Email_Address__c=melai@gmail.com, Status__c=Attended, Type__c=Issued}, Ticket__c:{Id=a0d9000000Byu6EAAR, First_Name__c=John, Last_Name__c=Lazy, Email_Address__c=john.lazy@gmail.com, Status__c=Attended, Type__c=Issued})

for(Ticket__c csvtickets: ticketlist){
    for(Ticket__c utickets: ticket_sa){
        if(!csvtickets.First_Name__c.contains(utickets.First_Name__c) && !csvtickets.Last_Name__c.contains(utickets.Last_Name__c) && !csvtickets.Email_Address__c.contains(utickets.Email_Address__c)){

            csvtickets.Status__c = 'Attended';
            csvtickets.Type__c = 'Non-Ticketed';
            ticket_new.add(csvtickets);

        }
    }
}

Mar Roxas   maro@gmail.com
Mar Roxas   maro@gmail.com
Grace   Poe gripo@yahoomail.com
Grace   Poe gripo@yahoomail.com
Jejomar Binay   jomay@hotmail.com
Jejomar Binay   jomay@hotmail.com
Rodrigo Duterte thirtythree@alphasys.com
Rodrigo Duterte thirtythree@alphasys.com
Melai   Hontiveros  melai@gmail.com
John    Lazy    john.lazy@gmail.com
Vicmar  Dahalili    vicdahalili@hotmail.com
Vicmar  Dahalili    vicdahalili@hotmail.com