The first step is to say hello politely, not flirtatious or flirtatious.
Step two, introduce yourself. If you pay attention to privacy, you can just say your nickname, such as "you can call me XXX". It helps to close the sense of distance, and I believe my sister will not be willing to chat with a stranger.
The third step is to directly explain the reason for adding her and get her WeChat. I believe every girl will ask this question. Don't just say that you just lost your number, just want to make friends. This first impression will be very bad. )
The fourth step is to sincerely show that your purpose is simple and harmless. I hope to make friends and get to know each other.
The fifth step, next, is to develop yourself. Brush my sister's circle of friends more, get to know her hobbies and find the same topic.
Note: Don't be frivolous, swear or brag for the first time.