it is a conversation between two friends about their journey to London.

John asked Lee what he talked with the travel agent regarding their journey to London. Then, Lee told that the agent informed him that it takes some more time, at least one week. For which, John asked him about whose work he was talking about. Upon which, Lee replied that he was telling about his (john) work only.

Please correct the paragraph for any mistakes,
I would very grateful to you.

John asked Lee what he had discussed with the travel agent regarding their journey to London. Lee replied that the agent had informed him that it would take a bit longer than expected, at least one week. Curious, John asked Lee whose work the agent was referring to. Lee clarified that the agent was actually referring to John's own work.

I'll correct it this once. After this, please work harder on correcting errors before you post, OK?

There seem to be two different conversations going on -- one about travel and one about work.

John asked Lee what he had said to the travel agent about their journey to London. Lee said the agent told him that it<~~I don't know what "it" is takes more time, at least one week. (The second sentence really doesn't make much sense unless you clarify what "it" is.)

John asked Lee whose work he was talking about. Lee replied that he was talking about John's work only.

Thank you ma'am