I BOOK TICKET FOR JINAN SHANGHAI NOW I AM IN LINQUIN CAN I CANCEL TICKETS FROM LINQUIN

I HAVE BUYED IN ADVANCE THREE TICKETS FROM SHANGHAI FOR JINAN TO SHANGHAI FOR DATES 30TH SEPT, 1ST OCTOBER AND 2ND OCTOBER. NOW I AM IN LINQUIN I WANT TO CANCEL TWO TICKETS FROM HERE WHETHER I CAN DO THE CANCELLATION FROM LINQUIN IN SHANDONG