<prompt> Translate the following text to EnglishTakwimu kamili za serikali hazipatikani kwa urahisi juu ya kiwango ambacho mashirika ya shirikisho yanashika na kutumia maili za kuruka mara kwa mara kwa safari za rasmi.  <response>: Comprehensive governmentwide data are not readily available on the extent to which federal agencies capture and use frequent flyer miles for official travel. 