Alice responds irritably, saying she hasn't had anything yet, so she can't have more. Her tone suggests she's annoyed by the suggestion of taking less or more, likely in a context where she feels her needs haven't been met.
The Hatter clarifies that it's easy to take more than nothing, implying that taking less isn't as straightforward as Alice thinks, and perhaps highlighting the absurd logic typical of Wonderland's characters. This exchange reflects the whimsical and nonsensical nature of the story.