Little Bird, can Fly high

The little bird in this story is compared to small hope. It can be a hope for happiness, a hope to win, or basically anything. If we have a little hope to win, we should never give up. In this story, there is one character who is sad because she has no hope to win and she is losing hope inside herself. One another character who never loses hope and this positive attitude always keeps him happy.
How both the characters linked each other, what is meaning of little bird here, its describe in this book.