If the business person speaks English, he/she will be pleased to speak the language with you. Else, may refer you to an English-speaking associate.
I had a somewhat "unique" experience with professionals from Quebec, many years ago.
I was attending a Canada regional conference in Toronto, Ontario. We were provided with headphones (for some of the sessions) because the speakers/presenters from Quebec wouldn't speak in English. We had to listen to the simultaneous translation while the presentation was going on.
A few years later, I attended a similar conference by our US-bheadquartered professional association. The new venue was in Montreal, Quebec. All the speakers spoke in English. I asked the Quebecois host, why when they were in Toronto, they spoke in French and we needed translators? He said, "Because we are from Quebec."
And why you presented now in English? "Because you are our guests."