Demon oak need help (look please)

[lajrek34a]

Hiho, i have this script :demonOakGravestone.lua
my question is how add to this script text: You already got your reward.
When i got reward and want go again to this room.

  function onUse(cid, item, fromPosition, itemEx, toPosition)
local position = {x=119, y=152, z=8} -- reward room
        if getPlayerStorageValue(cid, 35700) > 1 then
                doTeleportThing(cid, position)
                doSendMagicEffect(position, CONST_ME_TELEPORT)
        else
                return FALSE
        end
        return TRUE
end