pgupta011 -- Nope, not a fishing expedition. A genuine query from a genuine FlyerTalker. I expect we've all had our consciousness reaised recently in this regard and that way explain your reaction.
The way you'd book this is IAH to ORD, then ORD to TPA; you wouldn't ask a search engine to do something as illogical as route one through Chicago to go to Tampa from Houston.
Oh well,
KatW