Please check my sentences gramatically (7.12)

We've already made schedule that we would meet at 1:00pm, but we have to reschedule.
I make you wait for me almost for 30min.

I know there is a good bookstore in Seoul staion called Kyobo bookstore.
While reading books, the time that you wait for me will seem short.

My boss's father got lung cancer.
He got better but started worse again 3 months ago.
Now he is in critical condition.
I don't know how I can cheer him up.
I want to know how I give relief to him.
I pray god to stop him be sick.

My father used to be active when he was young.
He wants to takes a rest just lying on the sofa after work.
I want him to work out regularly for his health.
Although I suggest him to go outside with me but he rejects.
He said "I've already got old to work out. Go ahead alone. I can't go out to work out with you."

The older people get, the higher getting cancer rate.
I'm confident about my health.
Even though someone looks healthy, he or she might have awful disease.