Excuse me for interrupting. Excuse me for interrupting, but may I ask a quick question?
Sorry to bother you.
Sorry to bother you, but could you spare a moment to help me?
Apologies for the interruption.
Apologies for the interruption, but I need your assistance.
I hope I'm not disturbing you.
I hope I'm not disturbing you, but I need your input on this matter.
I'm sorry to disturb you.
I'm sorry to disturb you, but there's something I need to discuss with you.
I hope I'm not inconveniencing you.
I hope I'm not inconveniencing you, but I have a quick question.
Pardon the interruption.
Pardon the interruption, but could I have a moment of your time?
I apologize for the intrusion.
I apologize for the intrusion, but I have an urgent matter to discuss.
Forgive me for breaking in.
Forgive me for breaking in, but I need your expertise on this issue.
I'll make this quick; I don't want to disturb you.
I'll make this quick; I don't want to disturb you, but I have a brief request.