Yes, you act as a transmitter of the energies you pass on. But at the same time, Higher Beings work with the client separately. To a greater extent, it is the Higher Beings who do the work.
You can additionally conduct a session for yourself in parallel. That is, for yourself and the client.
The work will be carried out with both you and the client. These are two different processes, though. You do not energetically interact with the client in any way, nor does the client interact with you.
An online connection is mandatory.
Ideally, it should be by phone, or perhaps via a WhatsApp call, etc.
But it may happen that the client does not show up, even though you agreed in advance that if they did not come, the session would still take place at the specified time.
In that case, conduct the session and close the channel.
The client should also be able to contact you at any time—for example, via WhatsApp, Telegram, etc.