iphoto missing

Hi there,

I brought my macbook from UK and everything preinstalled including iPhoto.i move to India later and had some problems with my Mac.when i contact the Apple customer care service in india they told me my operating system was corrupt so they ask me to reinstall it.so i give to one mac authorised service center there and they reinstall the OS.next day i move to Dubai and found iPhoto missing.i try to install the iPhoto from Mac App store but i can't find it.when i contact the Apple customer care service in Dubai they told me my mac run with oldest version of OS X so ask me to install OS yosemite then the problem will solved.but when i discuss this issue in Apple support community one user told me even if i install os yosemite i don't get iPhoto coz he says i need to install iPhoto separately coz its not come with OS.i m bit confused and don't know how it install iPhoto in mac.is any one can help me in this issue?

Thank you