I tried to write a message

[diluohan]

Hi everyone,
I have to answer an email and it must be in a good english, but I'm really not use to write this kind of formal letter. Could you please help? Thank you very much.
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Dear Madam,
First I would like to apologize for my late answer. Our colleague, [name] , didn’t know about my private e-mail address and so gave you an address that I never used before. I just received this morning the codes to access you message. Sorry for that.
Concerning the job as a temporary Chinese teacher, I’m living in the area of Charleroi and I’m already teaching full time. Thus, I can’t manage to accept immediately an extra job in Maastricht, especially temporary job. But I really appreciate your proposition and hope that maybe in the future we will find another occasion to work together.
I hope that you’ll soon find someone for the job.
Best regards,