Hogy fogalmaznánk meg ezt angolul ?

Good morning/afternoon/day Mr "vezetéknév"!

I can't be present at today's meeting, because I have to go to a doctor. I can make up for it sometimes if it is necessary.

Thank you for your understanding,

"aláírásod"

Dear Mr ...

I would like to let you know that I won’t be able to attend today’s meeting, as I have a medical appointment.

I shall be available on an other day that is suitable for you.

Thank you for your understanding.

Regards

XY