FormsCentral does not have this functionality. Instead, I use FormsCentral and the form logic to get a person along the right path, and then link them to the appropriate web-based calendar scheduling application, that is outside of FormsCentral. There are some really good options out there that are relatively low cost. (The one we use is $20 per month for an unlimited number of calendars, each with their own direct-access URL if you wish.)
Not sure how the Adobe folks feel about this (and I don't work for this company nor do I have any financial interest in them), but the product we use is here.
I hope this helps,