Aside from what @AppleGoppy shared...
Share some childhood/school/college stories.
If you notice something around you or some item on the menu that reminds you of something, talk about that. Share a little about yourself, then ask a question like, 'Has something like that happened to you?'
What did you do over the week? If you read a book or watched something interesting, make a comment or an opinion about that. If the guy's interested, he'll give you his take on it. It could be anything from the cheesiness of Twilight or the San Bernardino shootings. But yeah, don't be fake, share whatever interests you. If he's evasive, you'll know that he's not into it or uncomfortable to make a comment about it. Switch topics. Ask him what caught his attention instead.
You can try discussing work environments. What you prefer or don't prefer.
Talk about clothes and style? Compliment him on something he's wearing. Talk about some designs that you like or are not into. For example, if he has a polkadot tie, it might suit him, so I'll compliment him on it. But I can have my 2 cents and say that I haven't picked polkadots in ages cos it's too dotty for me. Maybe it's too symmetrically aligned that it feels like a population count or an army. O_o Yeah, okay, maybe not. But you get the drift... I hope so? >.>'
Chistmas and New Year plans? Failed New Year resolutions? Best/goofiest moments you've had at events.
Well, basically, whatever you're talking about, keep the flow. One way of making it flow when you have a lack of ideas is.. whatever you just talked about, pick a word from it and digress to an area of interest. :)
Talking about food is usually endless. Lol.