I received a letter from you. I am very glad you have given me the opportunity to consider this: I'm interested in this. Immediately available for interview at your convenience.
I received a mail from you. I feel very glad that you have given me a chance to consider this time I'm interested in this job. Can an interview as soon as you have made.
I received a letter from you, and then I felt very glad that you have an opportunity, I will consider the work I'm INTERESTED. I can be shot as soon as the interview with you easy.