VXML question ; <NOMATCH> event need to capture caller's utterance

Hi
I am not sure if this is a right please to post here as it is a purely VXML quesiton.

I am trying to capture caller’s utterance during . I am able to capture the value when grammars match in block.

I am not sure how we can gett Utterance from the caller during NoMatch and NoInput.

If any one knows or did in the past please share the code. Appreciated.