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Dear Sir,

Kindly check the below sentences, is ok.

Thank you in advance.

Alli

Dear Sir,

I am presently doing some other quotation; once I am finished, I will prepare your quotations.

Thank you for your kind cooperation.

Thanks & regards,

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Dear Sir,

I am presently working on another quotation. Once I am finished, I will prepare yours.
I expect yours will be ready for your review on January 28 or 29. In the meantime, I will keep you updated on the progress.

Thank you for your kind cooperation.

Thanks & regards,