Call a stranger and ask something. What do you think is more polite to start with?

Hello, say' Hello, I'm XXX' at the beginning. If the other person's position is higher than yours and you want something from him, you should be calm and not weak. You can invite him to dinner first, preferably through a middleman. Now that people are warm and cold, not everyone does not look on coldly. I don't know what you are asking him. Ask him questions when you are ripe and see how he reacts. Asking someone to do things should give him some benefits. If you are not interested in him, why should he help you?