Greetings that convert best

Dear Live Chat Community Family,

Good day to you.
According to my view, i suggested to have solid and permanent greetings such has politeness and professionalism. Because we are under Healthcare Industry.
Can anyone suggest to me what would be the additional Greetings that i could be apply in Healthcare site?
Seek for assistance and advise.

Regards Jen
(RSDH Contact Centre, Malaysia)