It depends on the motivations for responding in the first place. If your looking to rebuke someone for doing what it is they think will help you or situation then the Whole "Changing God's plan" speech will do. Otherwise understand, that just because the original model for prayer does not include a wishing ceremony, it doesn't mean God doesnot consider that specific prayer request. Prayers are generally answered in a way that supports spiritual growth. Even if it is at the cost of one's physical health. At the same time if it benefits a person's spiritual life to physically get better then God generally will positively answer that prayer as well.
The Ultimate goal is spiritual growth no matter the physical cost or benefit. The tricky part for us is discerning how God always sees growth or benefit, so most of the time we pray in favor of what we think is the best out come according to our own interest.
If you wish to truly benefit from prayer as it was originally intended, The next time someone says they are praying for you, say: "Don't pray for my situation, pray that my heart receives the proper conditioning in this hardship so that i may one day say, What ever my lot, It is well with My soul. Help me learn to want God's ultimate will for my life, and not what i think I want. Even if it means my life."
That is a hard prayer to pray, and mean it. But, if you learn to pray for God's will in your life then no matter what you pray for you will always get what you want.