Excuse me, but...
Excuse my [me for] interrupting you, but….
Excuse me for interrupting you, but...
Excuse me for interrupting you, but...
Excuse me for interrupting you, but...
Sorry to trouble you, but...
I apologize for the inconvenience, but...
“I'm afraid there's no cream."—“It doesn't matter."
“French is difficult."—“To be sure (it is)."
“I'm sorry I stained your book."—“Forget it."
“Excuse me, but isn't that your purse?"—“Oh, thanks very much."
"Lemme see your painting, Manaka." "Must you? It's embarrassing!"