I have not devoted much time to interjections since most interjections are going to arise naturally so it is pointless to try to define them. There are going to be natural sounds like “huh” and “umm”. The Diinlang word “ke” can serve as a verbal marker for questions, the most likely use being to replace the sound “eh?” at the end of a statement.
I would suggest adopting “hey” as the standard greeting. It already fits the pronunciation standards of Diinlang, is already in wide use and is widely understood by the speakers of various languages. It serves to say “hello”, “I am here” and also “I acknowledge you”.
“Tshou” may be used as either a greeting or parting phrase. This is a phonetic rendition of the Italian “ciao” which has come to be used by many other nationalities. Both tshou and hey are time-independent greetings, useful in the modern world where people routinely communicate from different time zones.
“Sori” (sorry) seems like a good word to retain/ adopt for Diinlang. “No” is already in use in Diinlang and widely understood.
“Ya” or “yah” is used for “yes”. This allows us to retain the convention of “Y or N” with computers.
Originally I had the term “pro favori” for “please” but this is too many syllables. The word “miask” (from “I ask”) is used for “please” when making a request. It has been selected for verbal compactness and to remind the speaker that they are making a request, not a demand.
The word “kanen” means “gratitude” and can be used for “please” and for “thank you?” I do not recall how I selected this word but it will do for now.
“Sku” is used for “apology” or an alternate for “sorry”.
“Skuz” therefore means “many apologies”.