walk-in

varma voitto

sisäänastuttava

loikkari

pieni huone

ilman ajanvarausta sisääntulija puhekieltä that people may enter without a prior appointment
2014, (w), "http://www.theguardian.com/society/2014/aug/29/-sp-untold-story-culture-of-shame-ruzwana-bashir The untold story of how a culture of shame perpetuates abuse. I know, I was a victim", The Guardian, 29 August 2014:

On multiple occasions, beginning when she was 12, Sara went to her local GP and to walk-in clinics wearing her hijab to get the morning-after pill.

Still, a rapidly formed working group of Mossad wise men debated the risk in dealing with a walk-in, a volunteer who shows up bearing gifts."

An astute manager will have a table or two set aside for important regular customers or demanding walk-ins.