Enable the boot loader to load the second sector of a USB

I am learning the assembly language. I wrote a simple bootloader. After testing it out, it didn't work. Here is my code:

[bits 16]
[org 0x7c00]

jmp start

data:
wolf_wel_msg db 'Welcome to Bootloader!!!',0x0D,0x0A,0
wolf_kernel_load db 'Loading kernel....',0x0D,0x0A,0
wolf_error_msg db 'Kernel.bin not found!',0x0D,0x0A,0
wolf_error_msg1 db 'Press any key to restart..',0

start:
        mov si, wolf_wel_msg
    call wolf_print

    mov si, wolf_kernel_load
    call wolf_print

    pushf
    stc

    mov ah,00
    mov dl,00
    int 13h

    read_sector:
            mov ax, 0x0
        mov es, ax
        xor bx, bx
            mov ah, 02
        mov al, 01
        mov ch, 01
        mov cl, 02
        mov dh, 00
        mov dl, 00
        int 13h

    jc wolf_error
    popf
    jmp 0x0:0x1000
    cli
    hlt

    wolf_error:
            mov si, wolf_error_msg
        call wolf_print
        mov si, wolf_error_msg1
        call wolf_print
            mov ah,00
        int 16h
        xor ax,ax
        int 19h

    wolf_print:
            lodsb 
        or al,al
        jz exit
        mov ah,0x0e
        int 10h
        jmp wolf_print
        exit:
            ret

times 510-($-$$) db 0
dw 0xAA55

This code is placed in the first sector of the USB using this command:

dd if=f:\boot.bin of=\\.\d: bs=512 count=1

A simple program is loaded in the second sector of the USB using this command:

dd if=f:\hello.bin of=\\.\d: bs=512 seek=1 count=1

This is the code for the program loaded into the second sector:

[bits 16]
[org 0x1000]

jmp start
data:
   msg db 'Hello',0
start:
   mov si, msg
   jmp print

   cli
   hlt
   print:
      lodsb
      or al, al
      jz exit
      mov ah,0x0e
      int 10h
      jmp print
  exit:
      ret

Why is my boot loader not working? Have I done something wrong? Any suggestions?