My current job isn't too bad... other than we have to ask all guests if they need a shuttle to the airport in the morning... doesn't matter if they are staying 1 night or 20.
At the call center though we had, "would you like me to sign you up for the Priority Club with your reservation, it is free to join, only takes a few seconds, and with it you will earn points with every stay towards free nights"
and some I heard when calling hotels
"it's a wonderful day at the Holiday Inn, this is (name), how may I help you"
not too bad, the Indigo brand though had a doozy,
"It's a woderful day at the Hotel Indigo, this is (name), how can we inspire you today"