very good question,There is no absolute answer to this ,First of all ,make yourself comfortable in a conversation ,start with asking about prospect's personal detail ,what he/she do in their free time,and slowly move in with what you are doing and wait for a sign,(eyes contact can know what kind of reactions they give out,)than proceed with the introductions of SFI.Just let the conversation be natural.,I hope this will help you ,Good Luck
