Dear Khun Nopawan,
Thank you for your information. I wish to inform you that I cannot prepare coffee break with snack because you Let me know in a short time. But you can serve your participants with coffee from the coffee machine automatically in the dining room (self service) would greatly appreciate it if the next time you should let me know at least three days (in working day). The information that you should provide is the number of participants. Types of food and time to serve.
Thank you for your understanding.