For a photographer, the dining rooms are not the best lighted. They are dark in keeping with the ambiance of a restaurant. Our eyes see fine but our cameras need a little help. For me, that meant using high a ISO to increase the sensitivity of my camera's sensor to pick up the dim light and the use of Rear-sync flash (sometimes called second curtain) where the flash is fired at the end of the exposure. This helps to gather background details which using regular flash would make almost completely dark.