Informal	Neutral	Formal
Asking for action
Can you see to it?	Could you please act quickly to ..	I would be grateful if you could
Promising action
I'll make sure	We'll replace it	We will of course
Reassuring
Don't worry. I'll get onto it.	I'm sure we can find a solution.	I can assure you that
Asking to be contacted/updated
Please let me know what you plan to do.	Please could you keep me informed of
Apologizing
Sorry about that.	I’m very sorry about	Please accept our sincere apologies