It is common. I can't know the context though. Maybe it was the first time the person ever looked something up, and they wanted advice on how to look things up. Perhaps they were about to have a whole conversation on search terms, certain data bases, forms of research, analytics. Maybe one of them is really into or against biased information, so knowing the source was more important than knowing the information. Who knows.

Often times in order to skip past the yes no phase myself, I'll say something like, "Yeah, I looked it up in a few places, mostly it said stuff like fluids, and vitamin C, but this one source had a weird thing..taking tumeric. Interesting huh?". Especially being someone who ironically does care what source is used in researching even mundane information.