[header] How to small talk for successful business networking [title] Introduce and initiate. [step] Go ahead and initiate with a hello! Even if you recognize, or slightly know someone, re-introduce yourself. Be aware of how he introduces himself (you may know him as charles, but maybe he goes by chuck) and use his name throughout your interaction. 
This will help you remember it in the long run and also establish a personal connection. By taking ownership and initiating a conversation, you will feel more in control to drive the direction of the exchange.