It happens to the best of us. 这种事谁都会遇到。 There's no need to worry about it. 不必为那事烦恼。 Don't give it another thought. 别想得太多。 It can't be helped. 没办法呀!
I don't want to put you out. 我不想给您添麻烦。 This is nothing. 这算什么呀。 How terrible! 多糟糕呀! No big deal. 别小题大作。 I've seen worse. 这还算好的呢。 Don't feel so bad about yourself. 别那么自暴自弃。 What a pity! 真遗憾! It'll work out. 总会有办法的。 She's just upset. 她只是有点心烦。