Is it possible to make dialog from response of command?

[Jaehaks]

some commands require user's input after the command executes.
for example, clipboard command cb paste give prompts for confirmation if there are files with same name in clipboard.

I tried local output, err = Command('cb'):arg('paste'):spawn():wait_with_output() with stdin / stdout / stderr for all parameter.
only in the case of stderr is Commnad.PIPED, it works with paste forcely.
other case, output.stdin or output.stdout doesn't include any confirmation message.

how to catch the confirmation message after command executes?