Hey AmanManocha05,
Thanks for following up. Here's information regarding using FaceTime in Dubai: "FaceTime isn't available or might not appear on devices purchased in Saudi Arabia, Pakistan, and United Arab Emirates, including Dubai. However, with iOS 11.3 or later, FaceTime is available on iPhone, iPad, and iPod touch in Saudi Arabia. And with iOS 12.4 or later, FaceTime is available on iPhone, iPad, and iPod touch in Pakistan. Update your device to get FaceTime in Saudi Arabia and Pakistan." This information is from here: If you can't make a FaceTime call on your iPhone, iPad, or iPod touch - Apple Support.
Cheers.