What’s the most “NT” way of starting a conversation?

So today I made a conscious effort to start or try to start a bit of small talk between myself and a cashier. First of all they didn’t hear me which I thought was some sign I shouldn’t bother or did he hear me and was deliberately ignoring me? I am not sure. I ended up repeating myself by saying “busy today?” he replied with “not as busy as some weekends we have” fair enough answer. I made a comment on it being cooler in here and the outside is, it was a supermarket so they had air con luckily for them. I mean he didn’t seem that over the moon to be working at all so perhaps not the best start for my test but an experience anyway. I usually do not go out of my way to speak with others or start the conversation unless spoken to so I did plan what I was going to say but I will repeat this method perhaps with slightly different questions. I feel I need some scripts in my arsenal for different situations though. 

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