Dear Name:
I am glad that I have received an interview call from your organization but due to some sudden changes in my life, I will have to decline this golden opportunity. I have been recently diagnosed with “disease name” and have been recommended a few surgeries in the future and hence I won’t be physically fit to do any job for a while.
Though this is one of my dream jobs and I would definitely apply once I am hale and healthy and I hope I would then be getting a job offer for sure. Till then I wish you and the best candidate for this role. Though you can contact my college placement cell for more options as we are currently having a few students who are looking for roles.
Best Regards,
Your Name
Phone