Sorry Teia , and everyone else who said the same thing, but Good Day as two words is not normally used at the end of a conversation or meeting, unless it is Teia's abbreviation for the AE "Have a good day".
Good Day in BE is not used as much as it used to be, and is considered a little formal. At the start of a meeting it is common to hear good morning, good afternoon, hello, etc. There are, of course, many ways of saying good bye (goodbye), bye, etc.
Have a good day has a little bit of a negative sense in the UK as a phrase which flew over the Atlantic and is often linked to just having received very poor service from a rude assistant in a bad restaurant or shop who then uses the phrase as you leave. Any of our AE friends who feel outraged by this comment, please remember I haven't said whether I agree with this sense.