1) I am afraid I couldn't have dinner with you as planned. I am really sorry about it. I hope you have a pleasent trip tommorrow.
2) If it gets worse,he may need to be sent to the hospital.
i m afraid i can not have dinner with you as planned i m so sorry。Have a splendid voyage.
if things get worse,he need to see a doctor
I am afraid that I couldn't dine with you.That's really a pity.Wish you all the best.
If the situation goes worse,he will be sent to hospital.
I'm afraid that I can't enjoy the dinner with you tonight as appointed. I'm really sorry. Wish you a pleasant journey tomorrow!
If his conditions get worse, he may need to go to hospital.