To dream that you are waiting is indicative of issues of power/control and feelings of dependence/independence, especially in a relationship. Consider how you feel in the dream while you were waiting. If you are patient, then you know things will happen at their own pace. If you are impatient, then it means that you are being too demanding or that your expectations are too high.
Alternatively, the dream may denote your expectations and anxieties about some unknown situation or decision. You are experiencing a sense of anticipation or uneasiness.
To dream that you keep someone else waiting implies that you are taking advantage of this person. You Alternatively, the dream indicates that you are not spending enough time with this person in your waking life. You are too busy doing your own thing that you have overlooked this person.