[NAME, COMPANY AND ADDRESS, ex.
John Smith
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. John Smith], 

After careful review of all submissions, we are pleased to accept your bid of [DATE, ex. June 20] for [PRODUCT(S) / SERVICE(S) the following products:

2 A34 model commercial compressors
300 yards of 4 1/2" A34-compatible tubing] 

[SPECIFY NEXT STEP, ex. Accordingly, please fill our order to be shipped immediately.]  Call me at XXX-XXXX if I may be of any assistance.

Sincerely, 

[YOUR NAME, ex. Jill Jones]