If you require some information you can say：

　　-Could you tell me if/when/how much/why……？

　　-I wonder if you could tell me……？

　　-I'd like to know……

　　-I'd like some information about……

　　Or you can write：

　　We require the following information……

　　Please let us know whether/when/how much……

　　When someone gives you some information， you can reply：

　　-Oh， I see.

　　-That's interesting.

　　-Really？

　　-Thanks for letting me know.

　　If somesone asks you for information， you can reply：

　　-As far as I know， ……

　　-Well， in confidence， I can tell you that……

　　-I'm afraid I don't know.

　　-I've no idea， I'm afraid.

　　-I don't have that information available just now. Can I call you back？

　　-I'm not sure， I'll have to find out. Can I let you know tomorrow？

　　-I'm afraid I can't tell you that - it's confidential.

　　If you want to give someone some information you can say：

　　-I'd like you to know that……

　　-I think you should know that……

　　-Did you know that……？

　　Or you can write：

　　We should like to inform you that……

　　Here is the information you required……

　　If someone hasn't given you enough information you can say：

　　-Could you tell me some more about……？

　　-I'd like some more information about……

　　-I'd also like to know……

　　-When/How much/Why exactly……？

　　-There's something else I'd like to know……

　　-Can you give me some more details about……？