A slight correction: How do I reply to it.
The email is also a little odd 'carryout' is two words, not one.
The answer depends entirely on what you want to say. They are asking you to do something, then tell them that you have done that in a reply email.
Have you done what they ask? Is there a problem with what they ask? Do you need to give them any feedback on what they asked you to do?
We can't really suggest what to say, without knowing what you want to tell them.