Before you do everything, smile first. When you need some help, you should say:“Excuse me.” At the same time,if you show your unhappy face, he will be unhappy too. How can you get the help while he has no pleasure? So show your smile, and you will get his help. In fact, smile is a difficult job. It seems very difficult for you to smile when you are sad. Don't be afraid. Make up your mind to try once, only once, and you will find that you are much better in heart.