Whether with a friend or stranger, the first few seconds of any encounter sets the tone for what comes next so start with a smile. A smile is positive and it puts others at ease. Now open the conversation on a pleasant note and what follows will likely go well. There is much upside to being positive and pleasant and only downside to the reverse.
If you want to get ahead in life dress for the role you want, not the role you are in. Every person is a complete package. The way you look, the way you conduct yourself and the content of your conversation all send a message to the world around. You will be most successful in your career if you go through life understanding that “you are always on stage” and act accordingly.