1. I'm sorry for interrupting you, please go on.
2. We need to go through the terms and conditions before we agree.
3. What exactly are you trying to say? What are you getting at?
4. I'm sorry, Lynn, I didn't catch that. Can you say it again?
5. I'm sorry, he's taking a conference call at the moment, Can he phone you back?
6. Having gone through the process many times before, I know exactly which steps to take.