That's it for now. 

That's all for now. 

(You can even throw in a 'thank you' or a 'thanks', [in order to save those phrases from disappearing](https://english.stackexchange.com/questions/229982/what-is-happening-to-thank-you). I was being sarcastic, but in truth you can include them. 

Nothing else, thank you. (Here the 'thank you' is encouraged, else the 'nothing else' could seem too abrupt.) 

Not now, thank you (very much). (Added after OP's comment.) 

You can add 'Have a super day' or 'Have a great day' if you want. These specific terms may only be appropriate in American English, I'm not for certain.