When visitors are expected, they are recognized after 3 characters. For instance, if Paola Stensson is expected today, typing “pao” or “ste” in the first field will prompt her name and she’ll check in in 1 click.
When a visitor is not expected, he simply needs to enter his name and any info you want him to enter. See here a video:
Notice also how quickly hosts are recognized on the kiosk (00:26).