Dear Ms. Waraporn
I deeply regret to inform you that I will be unable to schedule a time to meet with you for an interview job tomorrow at 9.00 A.M.
Unfortunately, a conflict has arisen in my schedule, and I must cancel our appointment.
I sincerely apologize for informing you late and any inconvenience caused to you.
Thank you for your understanding in this matter.
Sakulthip Chaichana