What were your feelings in the dream? For me, that's generally the key to figuring out what the symbolism and imagery mean.

It could be a fear of separation from your family, since they went on the trip and you didn't. It could be feeling that you've forgotten or missed something important, as represented by the missing visa. Or it could be a fear of missing out on something like a big trip. But those are just guesses based on how I would feel in that situation, so they may not resonate with you.