Why did the café worker ask whether I was leaving in the rain?

I went up to ask for rest of my coffee in a takeaway cup because we were sitting outside because it started raining heavily. We decided to leave because we were getting wet. Another lady was getting my coffee in takeaway cup, when the other girl came up and asked if i was leaving. Why would she randomly ask me that?

Why did the café worker ask whether I was leaving in the rain?
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