Sometimes it is best to just pretend an event never happened. I presume the US, if asked by Pakistan about the incursion into their space, will have no idea what the Pakistanis are talking about. "There is no record of any such event, but we will certainly look into it and get back to you" sounds like the correct answer to me.
If the Pakistanis push on it, I suspect the next statement will be along the lines of "We are looking in to the matter right now. If it turns out that there is no further need for us to be involved in the region, we will be withdrawing our presence, including our $1 billion military aide package to Pakistan. Are you requesting that we expedite the review and have a quick response for you?"