Hi Khun Phisit,
Thank you for your email.
As you aware that D&B still has not completed the defect rectification work at Education building yet so the certificate of practical completion cannot be issued now. 
To enable us to discuss with the owner on the adjusted final account of original contract (as requested by D&B), please respond to this email that D&B has agreed with this final account amount.
After receiving the confirmation from D&B, we can then discuss with Raffles to proceed with the omission of the works from original contract and to award the new contract.
Could you please help to confirm this final account amount by today? 
As you know that it has taken so long already to finalise the contract so your prompt action would be appreciated. Thank you.