Thank you very much for your offer of employment as a Manager Trainee with XYZ Corporation. I am very interested in the position, but would like to request additional time to make my decision.
As you know, I am interviewing on campus this semester and considering several companies. The position with XYZ offers the long-range opportunity I am seeking, but I want to be sure that I am making the right decision. I hope to accept a position knowing I considered everything and can then focus whole-heartedly on making a contribution to the right employer.
I would like an extension until May1. Please let me know if that is possible and thank you again for the job offer.
Sincerely, John Davis