Prayers and thoughts

I do not know how to react when someone asks me to pray for something. I am even totally averse to the phrase "keep [x] in your thoughts" because it's the same damn thing, just couched under non-denominational wording to make us all feel better. It feels really dishonest to respond to this without saying something that would probably offend the other person, although perhaps, in the circumstance, it is better to be dishonest. Maybe I could be if I was given a minute to think about it. Dishonesty is just never my first reaction. In this particular situation, my usual response is to smile sheepishly or ignore the statement.