Hello. I'm afraid I need to skip our appointment due to unforeseen circumstances. I'm aware that since today's session has been canceled on such short notice, _______________. See you Monday.

These all work:

-you will charge me for it
-the system will charge me for it
-i will be charged for it

Hello. I'm afraid I need to skip our appointment due to unforeseen circumstances. I'm aware that since today's session has been canceled on such short notice, _______________. See you Monday.

These all work:

• you will charge me for it
• the system will charge me for it
• I will be charged for it