; JL - Jump if Less
section .data
    value1  db  15
    value2  db  20
    
section .text

_start:
    mov al, [value1]
    mov bl, [value2]
    cmp al, bl
    jl less
    
not_less:
    ;your ode here for the case when value1 is not less than vlaue2
    jmp done

less: 
    ;your code here fot the case when value1 is less than value2
    
done:
    ;your exit code here