Thank you very much, Mr Baker!
At first, I thought "do" in "Yes, I do" does not correspond to "would" in "Would you...." Then I checked a dictionary, which says 'In response to a question like "Would you help us?", you cannot answer it by saying "Yes, I would." You should say, "Certainly, I will."' So I was confused.
But in this case, should I think that it means "Yes, I would (be willing to)." and therefore, is appropriate?
I really appreciate it.
Takashi