Dear Mr. Tong,
Thank you so much for your letter of 2 February offering me the post of Travellng Salesman in your company.
I am glad to accept the post on the terms and conditions mentioned in your letter of appointment. I confirm that I shall join duty within the stipulated period and would not ask for any extension of the joining period on any account.
I want to assure you once again that I shall spare no pains to prove worthy of the confidence that you have upon me by effecting substantial increase in sales within 2-3 months.