I've replayed comms from the LiveATC EHAA-Radar-Southwest-Jan-19-2018-1330Z recording and attempted a transcription, starting at minute 01:08:
EHAA Radar: "And United 71, can you advise us how many ambulances you need at the gate?"
UAL71: "We have about, uh, twelve to sixteen passengers that don't feel well. It's not a dire emergency. They all got nauseous and, uh, [...] incapacitated because of [unintelligible]. It's all our flight attendants [...] our flight attendants, just a few passengers."
EHAA Radar: "United 71, could you repeat the last part of your message?"
UAL71: "We have a total of eight to fourteen people that need assistance, United 71."
EHAA Radar: "United 71, roger."