I would like to draw your attention to...

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It is regretful to learn of...

We regret to know...

Thank you for your great help.

We thank you for your great help.

We thank you for your cooperation.

We appreciate your cooperation.

We apologize for...

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We sincerely apologize for...

We have to apologize for...

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We should be obliged if you could cooperate with us.

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We find...it isn't acceptable.

Your reconsideration of...would be appreciated.

We would be delighted if you reconsider.

The one point that concern us is...

The one point that troubled us is...

Your suggestions are being followed up by...

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We would appreciate receiving your comments.

We would appreciate it if you could send us your comments.

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Kindly inform me when it is put into effect.

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We have been told by... that...

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