Thanks for your help.谢谢你的帮忙。
No problem.没什么了。No sweat
Many thanks for your help.谢谢你的帮助
You are welcome.欢迎你来找我帮忙
Not at all.没什么的。You bet
You bet that next time you ask me to help you, I'll help you.你打赌下次你让我帮你的时候,我会帮助你的。
It's the least I could do. 没什么。