Mail 1

"Dear client, due to aspects of licensing and billing in this case it is best if you license this image directly. Please let me know if that is fine with you and get in touch with the image agency to receive your license."

Mail 2
"Dear client, the image agency is waiting for your feedback in order to proceed with billing."

Mail 3
(Client)

"I thought this had been taken care of already?!"

Mail 4
"Dear Client,
No it has not, since we have been waiting for your action and you had not yet responded to this mail."