How do i convert the Base needed to a base needed of Assembly Language

.model small
.stack 100h
.data

Spc     db 0dh,0ah, " $"                                                ;New Line

;Bases Conversion
ConT    db 0dh,0ah, "   Conversion  $"                                  ;Conversion Title
ConBs3  db 0dh,0ah, "Base 3  to Base 5  "                           
        db 0dh,0ah,0dh,0ah, "Base 3 [00 to 22] : $"                     ;Enter Base 03 Number
EqBs3       db 0dh,0ah, "Base 5 Equivalent : $"                         ;Equivalent Base 05

ConBs4  db 0dh,0ah, "Base 4  to Base 5  "                           
        db 0dh,0ah,0dh,0ah, "Base 4 [00 to 33] : $"                     ;Enter Base 04 Number
EqBs4       db 0dh,0ah, "Base 5 Equivalent : $"                         ;Equivalent Base 05

ConBs5  db 0dh,0ah, "Base 5  to Base 4  "                           
        db 0dh,0ah,0dh,0ah, "Base 5 [00 to 44] : $"                     ;Enter Base 05 Number
EqBs5       db 0dh,0ah, "Base 4 Equivalent : $"                         ;Equivalent Base 04

.code
main proc

mov ax,@data                    ;initialize ds
mov ds,ax

mov ah,09h
lea dx, Spc                 ;new line
int 21h

mov ah,4Ch                      ;end here
int 21h

main endp
end main