Okay, so you've had your first encounter with an alien race. They don't seem hostile, and might even be friendly. So, how do you let them know you don't want to hurt them? You say hello. You tell them you don't want to hurt them. The classic way to do this, of course, is with the old standby of "I Come in Peace", but other greetings may be offered. If all goes well, diplomatic relations might be established. If not, well... This trope is an important part of How to Invade An Alien Planet. Examples of I Come in Peace include: