How do you avoid running out of things to say in relationships?

yesterday i saw these two women they looked roughly the same age in a resturant and they said nothing to eachother the whole meal I was shocked perplexed even and I was just wondering how do you avoid endless silence or long periods of silence in freindships or relationships. (the reason i ask is not to belittle anyone for enjoying that but I really enjoy talking and feel like thats how I connect better with people and when you run out of things to say its just awkward any thoughts?)

How do you avoid running out of things to say in relationships?
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