Asking for clarification
if you do not understand the question, politely ask the person to repeat or explain it.
I'm sorry. Could you repeat your question, please?
I'm afraid I didn't quite catch that.
I'm afraid I don't quite understand your question
Avoiding giving an answer
Sometimes you may not want to answer a question, perhaps because it's the wrong time for it or the question is irrelevant. When avoiding giving an answer, mask sure that your tone of voice is friendly and your reply is polite.
if you don't mind, I'd prefer not to discuss that today.