It is a privilege for me and my colleagues to have been invited by the ชื่อหน่วยงานผู้รับหนังสือ for a brief visit to meet with the representatives of the organizations and agencies responsible for economic cooperation with Thailand, I, personally, feel most honoured and greatly appreciate this invitation.
Unfortunately, owing to prior special assignments which have to be undertaken during the period suggested in Your Excellency’s letter, I regret I will not be able to accept your government’s kind invitation. However, I would be most grateful if Your Excellency would accept my thanks for such a hospitable invitation. I hope in the near future I will be in a position to accept Your Excellency’s kind offer.
Please accept, Excellency, the assurances of my highest consideration