To dream that you are eating dinner alone indicates that you need to do some serious thinking about your goals and directions in life. Alternatively, it may represent independence or lack of social skills.
To dream that you are eating dinner with others signifies your acceptance or others. It is a time to reflect and share past experiences. It also suggests that you see everyone as an equal.
To dream that you are a guest at a dinner party signifies enjoyable pleasures with close friends.