If you are calling FB from North America, they are usually very friendly but not able to help.

It seems like that FB runs a phone center in somewhere in Central America to catch all calls in North and South America.

I tried it once earlier with all segments available individually, but they were not able to pull the flights out. They tried, no luck, and told me there can be city pairs that you may find award availability for each segment but not being able to redeem. (e.g. YUL-ATL-PTP-CAY)

But it never hurts to ask.