"The freedom to control my own compensation with work that is a pleasure. Who doesn't love vacation!? It is rewarding to create those experiences for my clients!"

Ahh, that's better, a nice positive question to answer for a change! All the things you enjoy working in a travel agency can be mentioned as well as those that give you personal pleasure and satisfaction i.e. watching the smiles on the family's faces when their travel plans went better than they ever expected, the e-mail note of appreciation for the extra stops you pulled out to change a hotel that didn't have a sea view but a sight of the garbage cans! The meeting of all the generally nice customers who have saved up their hard earned money for a trip of a lifetime etc. etc. Anything that will show the interviewer you would enjoy the job and the maximum benefit you would gain from it all if you were given the chance.