Speak slowly. Make a conscious effort. Smile.

Don't take the cliche advice and "just be yourself." Put some effort into being warm and open. Ironically, studies show putting your best foot forward actually reveals the real you:

In sum, positive self-presentation facilitates more accurate impressions, indicating that putting one's best self forward helps reveal one's true self. ["Your Best Self Helps Reveal Your True Self: Positive Self-Presentation Leads to More Accurate Personality Impressions," Social Psychological and Personality Science]

Smiles are powerful and make you more attractive. From Dale Carnegie to peer-reviewed studies, everyone says smiles matter. (In fact, to increase their power, smile slower.)

FBI behavior expert Robin Dreeke recommends speaking slowly.

Via It's Not All About "Me": The Top Ten Techniques for Building Quick Rapport with Anyone:

When individuals speak slowly and clearly, they tend to sound more credible than those who speak quickly.

How can you strategically make a good impression?

From the outset, frame the conversation with a few well-rehearsed sentences regarding how you want to be perceived. This will end up being the structure the other person forms their memories around.