Does this look like a rude answer to his answer ? Dear Dr,
Your help is so important to me so I would like to deeply thank you for willing to do that in the future. 
I understand and respect that, thank you so much!
Also, I know you are extremely busy so I do not want to take too much of your time away: Since I will be doing a clerkship in august, and since they just asked my preference on which ward I’d like to apply to, seeing that I’d like to apply for a plastic surgery rotation, I was wondering if it would be possible to ask you for a testimonial or a brief statement about my participation in the course, in order to enhance my chances to rotate in this field in august. 
This could be sent to my university  too if you prefer, or also directly to me.  
