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I'm sorry for the trouble, but thank you in advance.
Only if you're comfortable with it.
To put it without ruffling any feathers...
I'm sorry, I should have been more thoughtful.
Just so you know, I'll mention this.
Please, only as far as it's reasonable for you.
I'm sorry, this is on my end, but...
If anything bothers you, please don't hesitate to say so.
I'm terribly sorry, but could you bear with me a moment?
I apologize for the abrupt request.
Whenever it's convenient for you is fine.
Let me just add one thing to be safe.