dear friend
thank you for your inviting, but unfortunately i could not go to the cinema with you as i have to go to the doctor on that time. i know it may be so frustrated for you. In fact it is same for me. I am really sorry about that and hopefully you can understand. by the way, i would be happy to invite you to watch a moive later when i'm getting better if you like. talk soon.
Thank you for your kindness. Although I'纯大d love to, but I want to go to see a doctor, I can'桥或t go to the cinema. Or thank you for inviting me to go to see a movie. I'做消竖m very sorry.