As Emily said, use either kindly or please. "Could you kindly provide me with the sales reports from January?" It's very formal, but be careful as it can be used sarcastically! If the sales reports are a month overdue and you've already asked once, asking again with "kindly" would sound sarcastic and please would be better. It is an adverb yes.

I think its either "Could you please help to sort out this issue?" or "Could you kindly help to sort out this issue?".