Be good at small talk.
Many of the jobs you get at first will only be a day, maybe two. You're going to be making a LOT of small talk with people.
Get some conversational skills. Ask polite, but appropriate questions. Practice listening (it's called small talk, because you should listen more;)
And here's a really good one; try to remember one distinct thing about each person. Even if you don't remember a person's name, if the next time you see them, you can say, "Didn't you tell me about a great place for pizza in Austin?" They'll be both surprised and delighted that you remembered something unique about them.
If you remember their name too...even better.