Can or May ?

[Zoe2008]

Which one is better for this sentence ? And the sentence is correct ? Thanks to advice.

Can / May we have your final decision today? Otherwise, we are afraid we cannot keep the shipment before the end of March

 

[Horsa]

Good job! Both are OK 'May' is more formal and so better here.

Can / May we have your final decision today? Otherwise, we are afraid we will not be able to make the shipment before the end of March.