Write a clear and effective letter based on the scenario provided below for your program of study:
For ICHS Program Students:
You are a nurse at CHEO and you work in the autism program. You receive hundreds of requests from families to register in the ABA-based intervention program each year. You must write a letter to one hopeful applicant informing him that his request for his eight-year-old son to be admitted to the program is being denied due to limited space. You must inform him that a waitlist is available and provide him with other alternatives.