I had a meeting with my former teacher in my former school.
  When we were enjoying our tea and pan cake, I saw Prof. nickname, and we invited him to join us.
An hour later, after the tea, Prof. nickname left first and he was walking back to his office.
  I ran after him and asked if he had time to write a recommendation letter for me, he told that he was busy with hsi teaching and could not write the letter for me.
I could see on his face that he felt so sorry about it, and I wanted to comfort him but I did not know what I should say.
  Given that situation, how would you comfort your teacher like friends whom could not help you with a recommendation form?

I had a meeting with my former teacher in my former school. While we were enjoying our tea and pan cake, I saw Prof. Nickname, and we invited him to join us. An hour later, after the tea, Prof. Nickname left first and was walking back to his office. I ran after him and asked if he had time to write a recommendation letter for me, and he told me that he was busy with his teaching and could not write the letter for me. I could see on his face that he felt so sorry about it, and I wanted to comfort him but I did not know what I should say. Given that situation, how would you comfort your teacher who could not help you with a recommendation?