Answer:
Look at the person.
Use a calm voice.
Say clearly that you do not want to engage in that activity.
Suggest another activity. Give a reason.
If the person tries to convince you, keep saying "No."
And also here is a list of things you could do:
Say “NO THANKS.” The easiest but some forget to try it. ...
Strength in numbers. ...
Use Humor. ...
Give a Reason, Fact or Excuse. ...
Cold Shoulder or Ignore. ...
Change the Subject. ...
Walk Away. ...
Broken Record or Repeated Refusal.
