Task: Question Answering
Input (English): Context: I was talking to my friend Mary . So I ended back on my original plane with United in business class , 1 free ticket , and 1 round trip on IAH train . So Leslie picked me up from the airport . Do n't slam her car doors .... she gets pissy . We meet dad for a long lunch at Champ 's and then head home . 
Question: Based on the call letters , the ticket is either to or from what city 's airport ?
Output (English): Houston.