Viết đoạn văn tiếng anh theo các ý sau

ai giúp mình viết một đoạn đầy đủ với 
4. Respond as if you worked at the clinic
In your response, be sure to show that you recognize the problem, and propose a way of dealing with the problem.
Here is the problem:
Hi, this is Harry Wilson. I’m calling about my appointment* with your doctor. I booked an appointment with Doctor Abrams this Saturday, but I have just found out that I’m busy on this day. What should I do?