Sorry, I don't know

It was a large international airport. Lots of people with uniforms. I asked for directions to four people. Three out of four gave me the wrong directions. Three times we wandered around, misdirected.
Their uniforms looked good. The people looked important. But they didn’t know the answer. I suppose they were just confused.
No, they don’t need to know all the answers. But there seems to be an “international” expectation that one should know all the answers. Thus the reason they spoke up and gave the wrong answer.
But its better to say “Sorry, I don’t know.”
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