I'm big on dreams, so I thought I'd make some suggestions. I'm going to assume that this dream isn't referring to some practical matter like actually going on a trip with someone. I'm going to assume it's all symbolic. :-)
A trip is a good thing. It shows progressing in some aspect of your life. It could be practical, like with work or some creative project or relationship, or it could be psychological, like some phase of self-discovery.
Did you know the girl at all? Just curious because if so then I suggest you explore characteristics of the person in real life. That can tell you more about what she represents to you in the dream. Assuming she's a stranger, she can represent a "feminine" part of you. That means things like emotions and intuition, all traditionally represented by the "feminine" (but of course existing in all of us).
You seem to be on your way to starting something new in this dream (again, practical or psychological), and you were following your feelings and intuition on that, but then you might have gotten sidetracked or perhaps felt bad or hesitant to follow your feelings and intuition. Hence the girl disappeared.
You turned to an older woman. Elderly people in dreams can represent something old that needs to be "retired," especially since the elderly woman didn't help you locate the girl, which was your goal. Maybe she represents some old attitude or feeling or tendency that you need to lay to rest.
In other words, you may have been ready to start something new or some new phase of your personal growth in a different way, one more consistent with what you really feel and want, but then pulled back from doing it that way, falling back on some old tendency that's not going to get you where you want to go right now.
I think the end of the dream shows the next step. Eating in a dream can represent nourishment. Think about what will nourish you right now, even if it's not the most logical thing or even makes you feel kind of guilty. Go with what nourishes you.
I know this sounds kind of vague, but the meaning of a dream has a lot to do with what's going on in your life, and that's something only you can really know. Usually some issue popped up in the 24 to 48 hours prior to the dream that your mind thinks you need to pay attention to. So this new journey or progress that's been delayed could relate to work issues, personal relationships, a new project, a new interest, or just some new attitude or belief or way of doing things.
I think the dream is saying that the key to finding the girl and getting on your way is to tap into your intuition and feelings and figure out what will nourish you in your life right now.
I hope that helps.
Sorry it got wordy. Glad it was meaningful to you. :-)
The bus depot symbolism sounds like you are dealing with a situation in your life that is difficult to be patient with or forces you to be patient. The old woman you seek help from may reflect your search for passive experience or experience with putting others first. You never find the woman that was with you originally because it may represent how you feel you've lost a method or resource you had. All the different kinds of food at the end may represent different idea.
"To dream of waiting at bus stop represents an unpleasant or powerless experience you are expecting to happen. Waiting for a situation to occur that you don't believe will feel good." From: http://www.dreambible.com/search.php?q=bus+stop
OP: "please let me know the meaning"
Rainbow Gryphon on October 13, 2013: "the meaning of a dream has a lot to do with what's going on in your life, and that's something only you can really know"
Ed on October 21, 2013: "dreams are personal and the symbols that your subconscious uses can be entirely different from someone else"
So you have to do your own work to interpret (I prefer to say "distil the message of") the dream. The book "Inner Work" by Robert A Johnson has fifty or sixty pages on dream interpretation and I've found it very interesting and useful. The process is time-consuming, the more so as the dream will be telling you something that you're not already consciously aware of and/or you're resistant to or defended against. So the 'obvious' (personal) interpretation is unlikely to be the right one, still less he 'comfortable' personal interpretation.