One day, we went to a mall, and my little brother got lost in the mall in a very short time because he was running around. When he realized he couldn't find us, he assumed we had moved to the next store and started chasing after us. After searching for a while, he still couldn't find us anywhere, so he burst out crying. Meanwhile, a nice lady went to my brother, and asked him, “Why are you crying?” My brother said, “I cannot find my mom, I am lost.” The nice lady asked my brother, “What is your mom’s phone number?” and let my brother use her mobile, and saved the day. We gave a big "thank you" to the nice lady.