| I have no idea. |
| I don’t have a clue. |
| Hmm (interjection) |
| I’m unsure. |
| Let me check on that. |
| Who knows? |
| I’m not 100% sure on that. |
| Sorry. I don’t know. |
| Search me. |
| I’m afraid. I’ve no idea. |
| I don’t know anything about … |
| I haven’t got a clue. |
| What are you asking me for? |
| Don’t ask me. |
| That requires a bit more research first. |
| I’m going to investigate that further. |
| Beats me. |
| I can’t remember off the top of my head. |
| I don’t have any information about that. |
| That’s a good question, I’II check this. |
| I’m not the best person to answer that. |
| That’s exactly what I’m seeking to answer. |
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