I am looking to add the dining plan for the 2nd half of my split stay (5 nights). We currently have 5 total people for the full duration of nights but another adult will be joining us from nights 3, 4 and 5. Can I purchase the dining for the 5 people now and add on this additional person the day before night 3? Has anyone done this before? The adult is currently on the reservation for the 2nd half of this split stay.