I have an idea: adding the function enabling information that the agent read the client's chat message and vice versa. So, when the agent did read the client's message, under the client's message will be inscription "read" and vice versa. I think it's a really interesting idea. The client will know when the agent did read his message, and if he does not reply, "neglecting" it and vice versa, the agent will know when the client has read his message.