Dear Sir, I will (delete) have a meeting tomorrow with you on (I'd say 'at') 2:00P.M. But I have had my leg hurt (hurt my leg) this morning so badly that maybe I couldn't (will not be able to) go to the meeting tomorrow. I am very sorry for the absence and for making your time wasted (the inconvenience caused) because of my absence. As you know, I have an extension on my dissertation and I will keep in touch with you by e-mail. Can (could) I ask for your suggestion (=ask you for suggestions) if I meet (have) problems on (with)the writing? And (delete)I will send you my literature review as soon as possible.
Thanking you in advance, I look forward to hearing from you.
Yours sincerely, Joe
These are the changes I'd make.
