Don't try to be someone else or pretend that you know what they're thinking.
Smiling makes people feel happy and relaxed, which is a really good thing.
Ask for a very little help and give a big thank you! It will make them feel good to help you.
Show interest in other people—not just their interests but also in their lives!
Show some genuine curiosity about the person and they'll feel more inclined to open up further with you too!
Don't make assumptions about what they're thinking or feeling. Notice in which thing they have interest.
When you are listening, you are letting someone know that they are important to you.