Could you please tell me how it is called when I am asking somebody (who is e.g. in another city) to give me something through a third person (going to my city) who can hand it to me when we meet. For example:
Please hand this thing through our friend (who is going to my city soon).
Please have our friend bring me this book when he comes to town)
This is what I mean. But I thought that there's one word to express this idea. This situation is similar to asking somebody at the table to pass you, e.g., the salt.
Aren't there any other ways to say it?