y & Y Right other letter Wrong

.MODEL SMALL
.STACK 100H
.DATA

MSG1 DW "INPUT IS RIGHT. $"
MSG2 DW "INPUT IS WRONG. $"

.CODE
MAIN PROC

    MOV AX,@DATA
    MOV DS,AX

    MOV AH,1
    INT 21H
    MOV BL,AL

    MOV AH,2
    MOV DL,0AH
    INT 21H
    MOV DL,0DH
    INT 21H

    CMP BL,'Y'
    JE OK
    CMP BL,'y'
    JE OK

    MOV AH,9
    LEA DX,MSG2
    INT 21H
    JMP END_IF

    OK:
    MOV AH,9
    LEA DX,MSG1
    INT 21H

    END_IF:
    MAIN ENDP
END MAIN