Dear Ms. Jirunya,
I'm really excited to received your email informing me of an interview. I am very much interest in this position. However,I am currently out of country and will be back to Thailand on 26 February 2016. For this reason, I would really appreciate if you can kindly reschedule the interview to any date and time after 26th February.
Please accept my sincere apology for any inconvenience caused.
Thank you so much for your understanding.
Sincerely,