I always discuss with a WG on the phone, or AW email what services I'm expecting, it's common sense. To be honest expecting fisting without any prior discussion is a bit of a gaff; I suspect even those that offer this would want to know in advance.
When less sure, e.g. with poor English, I'll send a confirmation text typically of the form :
"Confirm I'll be there at 3pm, expecting RO, OWO, DFK, 1 hour £100 OK?"
A zero response to this text is a potential sign of impending disaster. Depending if dick is driving, or me, I may pull out, and implement plan B. I will always let them know that it's due to no response - be flexible though, they can't reply mid-punt - we'd all be annoyed with that.