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Please don't trouble yourself; carry on.
I'm terribly sorry, but could you bear with me a moment?
Just to add, for the record...
I'm sorry, this is on my end, but...
If I may be so bold, let me make a suggestion.
Just so you know, I'll mention this.
If it's alright, could I have a moment later?
To put it without ruffling any feathers...
Forgive me for asking, but...
I'm sorry for the trouble, but thank you in advance.
There's no rush on your reply, take your time.
I hope this isn't too personal, but...