How shall i do it.sir?
just tidy it up a bit,please.
Do you want some spary?

Is anybody looking after you?
NO,i'm after a size 40-neek pullover in grey.

How much is this greetings telegram to germany.please?
I'll just make sure.anything else?
Yes.Half a dozen air mail labels and a book of stamps.
sevety-five pence exactly,please.

I keep feeling dizzy,and i've got a headache.
how long has this been going on?
It came on yesterday.
What ought i to to?
It's nothing serious,but you'd better stay in bed for a day or two.
帮小弟翻译一下，全部，谢谢？？？

—How shall I do it, sir?
—Just tidy it up a bit, please.
—Do you want some spray?
—No, nothing at all. Thank you very much.

——先生，我能为您效劳些什么？
——你把它（难道是车？）弄干净就行了。
——你需要喷漆吗？
——哦，不用。谢谢你。

—Is anybody looking after you?
—No. I'm after a size 40 V-neck pullover in grey.
——有售货员问过您需要什么吗？
——没有。我想要尺码是40号的V字领的灰色套衫。

（我估计这个 look after有招呼的意思）
—How much is this greetings telegram to Germany, please?
—I'll just make sure. Anything else?
—Yes. Half a dozen air mail labels and a book of stamps.
—Seventy-five pence exactly, please.
——这份送往德国的贺电要多少钱？
——我待会儿查一下。还有什么别的吗？
——使得。半打航空标签和一本邮票。
——75便士，谢谢。

—I keep feeling dizzy, and I've got a headache.
—How long has this been going on?
—It came on yesterday.
—I should say you're generally run down.
—What ought I to do?
—It's nothing serious, but you'd better stay in bed for a day or two.
——我一直觉得晕眩，而且我还头疼。
——这样持续多久了？
——昨天变成这样的。
——我觉得你主要是劳累过度了，吃不消了。
——我该做什么呢？
——没什么要紧的，不过你最好在床上休息个一两天。

兄弟啊～帮你翻了已经是一箩筐的英语翻译了～～～你自己在斟酌一下吧～～～～有些地方语境我也是用猜的～～～