Here is a link to a great article that describes an easy way to help your child not interrupt when they need to talk to you. It takes a little practice but really works! I would just pretend a role play to try it out. Another great way to help your child practice is by following the same process when they are busy and you need their attention. I can’t believe I forgot to teach this to the kids at school this year(I usually do). Hope this helps at home!
Here is a video showing the kids how it is done!