Try different words to express yourself.
What to Say
What alternatives can you say yes... "Certainly."
What do you say when hearing unwanted advice.... "That sounds interesting."
What do you say when hearing "How are you? .... "I'm doing good and you?" (Always ask back)
What Not to Say
When you reply or respond emails only a little bit late. Don't say "Sorry for the delay." instead say "Thanks for your patient."
When someone say "Thank you." Don't say "No problem." instead say "Always happy to help!"