Dear Rasika
a suggestive format is given below
Mr......................
.........................
.........................
Dear Sir
sub :- Completion of project on.........(give details)...........
I have beeen with your comapny since ......(give date) in connection with preparing a project on........(give detaills).......... I have successfully completed the project on....(date)......The project turned out to be an excellent piece of work. It would not have been possible but for the unstinted cooperation extended by you and your staff.It is a rewarding experience to associate myself with your company in connection withthe project. I am thankful for the same to all of you
With regards.
Yours sincerely
Note _ you may suitably modify it.Hope it will be of some help.
B.Saikumar
HR & Labour Law consultant
Chipinbiz Consultancy. Pvt.Ltd
Mumbai
Tel: 09930532927