Excuse me, Professor Webber?
Yes, Yulong? What do you need?
I was hoping you would write a letter of recommendation. I want to enter a doctoral program in artificial intelligence. I think your recommendation is most important to me.
Good news! I'll be glad to. When do you need it?
The deadline is next weekend, but I would be really thankful if you could write it this week.
Okay, no problem.