www.psychologytoday.com/blog/changepower/201210/speak-18-all-purpose-assertive-phrases
All of the statements below are basic assertions--short statements that communicate a quick “no” or “yes” to the other person. (For an instant course in Assertiveness 101, see this blog.) Although basic assertions could come across as overly business-like or brusque, they don’t violate the other person’s rights or disrespect him or her. Assuming you use a firm, respectful tone of voice and appropriate body language, no one will mistake you for Doc Martin.
Each statement below briefly acknowledges the other person, then proceeds to a statement of your own wants, feelings, or ideas. These are conversation-enders--a fast way to save you time, money, and/or self-respect.
The following basic assertions could be described as "thanks, but..." statements:
“Thanks, but I’m not interested.”
“Thanks, but I can’t make that a priority right now.”
“Thanks, but I need some time to myself right now."
"Thanks, but no thanks." (A classic!)
“No thanks.” As reader Kristie pointed out in "Comments" on the previous blog, it’s not necessary to give a reason—only a smile.
Slightly more empathic are these more elaborate "thanks, but..." statements:
"Thanks for thinking of me, but I think I'll pass on this one."
"Thanks for keeping me in the loop, but I can't make it this time."
"Thank you for sharing, but I'd like to hear from other people in the group."
“I appreciate that you enjoy doing ___, but it’s really not my scene.” (Thanks to reader TT for this cool phrase!)
Notice that the phrase, "Thanks, but..." could be used to provide a dash of empathy before almost any assertive statement.
Statements that can buy you a little time include these:
"I'll think about it and get back to you."
"I just don't know. Mind if I think about it for a while?"
"This is so important, and I can't give it the time it deserves right now. Can we make an appointment to talk?"
Then there are brief “I” statements—a sharing of your thoughts, feelings, wants, or opinions:
“I didn’t appreciate (what you did, your tone of voice).”
“I appreciated .” (Yes, assertiveness can be used to express your positive feelings in a situation.)
“I disagree with you. I see the situation this way.”
“I would like you to respect my point of view.”
"I feel offended by your remark."