Could I have a knife and fork?
我可以要一副刀叉吗？
A Are you having difficulty with your chopsticks?
A 你用筷子有困难吗？
B I'm sorry. I haven't used chopsticks very often.
B 很抱歉。我不经常用筷子。
A Let me show you how to hold them.
A 让我示范给你看。
B Like this? Oh, dear, I've dropped one. It’s quite difficult when you are not used to them.
B 像这样？噢，天哪！我弄掉了一只。当你不习惯用筷子的时候这太难了。
A Never mind, we'll get some more.
A 不必介意。我们再多要一些。
B I'm sorry. I hope I'm not rude but could I have a knife and fork, do you think?
B 对不起。我希望我这样说不算无礼，我可以要一副刀叉吗？

Notes注释
1 If someone needs help, for example, holding chopsticks, you can offer help: Let me show you how to hold them. / Let me show you how to hold them.
如果某人需要帮助，例如，如何拿筷子，你可以主动帮忙：Let me show you how to hold them. /让我示范给你看。
2 Although one never wants to be rude, sometimes it's necessary to ask for special help, for example; I'm sorry. / I'm sorry. I hope I'm not rude but could I have a knife and fork? / I hope I'm not rude but could I have a knife and fork?
尽管你不想表现得无礼，但有时请求特殊的帮助也是必要的，例如：I'm sorry. /对不起。I hope I'm not rude but could I have a knife and fork? /我希望我这样说不算无礼，我可以要一副刀叉吗？

Key phrases and sentences
Are you having difficulty with your chopsticks?
I'm sorry. I haven't used chopsticks very often.
Let me show you how to hold them.
Like this? Oh, dear, I've dropped one.
It’s quite difficult when you are not used to them
Never mind, we'll get some more.
I'm sorry. I hope I'm not rude but could I have a knife and fork, do you think?

你用筷子有困难吗？
很抱歉。我不经常用筷子。
让我示范给你看。
像这样？噢，天哪！我弄掉了一只。
当你不习惯用筷子的时候这太难了。
不必介意。我们再多要一些。
对不起。我希望我这样说不算无礼，我可以要一副刀叉吗？