21. The non-transitory computer readable medium of claim 16 , the process further comprising: receiving, from the client device, information about a second audio presentation being presented on the client device; and selecting the applicable item using the information.
16. A non-transitory computer readable medium comprising executable code that, when executed by a processor, causes a computing device to perform a process comprising: transmitting, to a client device: an audio presentation comprising a first portion and a second portion, wherein the first portion corresponds to a first item and the second portion corresponds to a second item; a first marker corresponding to the first item; and a second marker corresponding to the second item; receiving, from the client device: audio data comprising a user utterance; and marker data comprising the first marker or the second marker; and selecting an item based at least on the marker data or the audio data, wherein the selected item comprises the first item or the second item.