It's all right.
B1It's acceptable; don't worry about it.
My apologies.
B1I am sorry.
Let's forget about it.
B1Let's ignore the awkward moment.
I didn't mean to...
B1I didn't intend to cause offense or discomfort.
Could we change the subject?
B1Can we discuss something else?
That's okay.
B1It's not a problem.
No problem.
B1It's not a problem.
It's a bit embarrassing.
B1The situation is slightly shameful.
I'm so sorry.
B1I express deep regret.
Oops!
B1An exclamation of a small mistake.
Oh dear.
B1An expression of mild concern or disappointment.
That's unfortunate.
B1That's unlucky or regrettable.
How awkward!
B1What an uncomfortable situation!
I'm a little embarrassed.
B1I feel slightly ashamed.
Please excuse me.
B1Pardon my behavior.
Can we just forget this?
B1Let's ignore what happened.
Let's try to forget it happened.
B1Let's try to ignore what happened.
I'm really sorry about that.
B1I express deep regret about what happened.
I feel terrible about that.
B1I feel very bad about what happened.
I should have...
B1I regret that I did/didn't do something.
Things happen.
B1Mistakes occur; it's a part of life.
Let's just move on.
B2To change the subject to avoid further awkwardness.
I think there's been a misunderstanding.
B2To suggest a miscommunication to soften a tense situation.
No harm done.
B2To reassure someone that a minor mistake is not a big deal.