It's nice to tell people to have a great day.
Neil is at the office and about to walk past his coworker Jack in the hallway.
Neil wants to greet Jack.
Neil tells John hello and tells him that he hopes John has a wonderful day today.
Neil gives John a tiny smirk and waves at him with a quick and mumbled hello.
John is pleased to be greeted so pleasantly and it makes him smile.
John thinks that Neil is awkward and wonders why he seems so nervous around him.