public OnDialogResponse(playerid)
if(!strcmp(cmdtext, "/drinks", true))
{
    ShowPlayerDialog(playerid, 1, DIALOG_STYLE_LIST, "What is it that you want?", "Sprunk ($1)\nBeer ($2)\nWine ($3)", "Purchase", "Cancel");
    return 1;
}
}

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
if(response)// They pressed the first button. 
    {
    switch(dialogid)// If you only have one dialog, then this isn't required, but it's neater for when you implement more dialogs. 
        {
		case 1:// Our dialog!
    	    {
           	switch(listitem)// Checking which listitem was selected
        	{
        	    case 0:// The first item listed
        	    {
        	        if(GetPlayerMoney(playerid) < 1) return SendClientMessage(playerid, 0xFFFFFF, "You don't have enough cash.");
        	        GivePlayerMoney(playerid, -1);
        	        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_DRINK_SPRUNK);
        	    }
        	    case 1: // The second item listed
        	    {
        	        if(GetPlayerMoney(playerid) < 2) return SendClientMessage(playerid, 0xFFFFFF, "You don't have enough cash.");
        	        GivePlayerMoney(playerid, -2);
        	        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_DRINK_BEER);
        	    }
        	    case 2: // The third item listed
        	    {
        	        if(GetPlayerMoney(playerid) < 3) return SendClientMessage(playerid, 0xFFFFFF, "You don't have enough cash.");
        	        GivePlayerMoney(playerid, -3);
        	        SetPlayerSpecialAction(playerid, SPECIAL_ACTION_DRINK_WINE);
        	    }
        	}
    	    }
	}
    }
    return 1;
}