I am looking for a word or phrase that captures the idea of a frequently uttered sentence, phrase, or question.
For instance, there is one sentence or phrase which can be uttered most often during communication:
Henry: Your best friend has stolen my pen.
John: - What is his name? James? James is honest; he wouldn't steal anyone's pen.
John asked "What's his name?" even when he knows that his best friend's name is James.
For another example, suppose John meets his best friend, James, and asked James whether he had stolen the pen:
John: James, did you steel Henry's pen? He blamed you.
James: No, I didn't steal it. But I did see my younger brother, Jacob, steal that pen.
John: What's his name? Harry? Perhaps he stole it.
I have two examples of such repeatedly uttered sentences/arguments in my native language (with translation):
Mind na kariye ga. [translation: don't mind]
Allah apko neki de. [translation: may Allah guide you]
Note that the word earworm is not what I am looking for. Earworm means:
A catchy song or tune that runs continually through a person's mind.
Thus it is wrong to use such word in this case.