How to change device model in build.prop?

The following is my build.prop file. I just can't find the device model option so I can modify it. I'm trying to change my device model to Pixel XL so I can run Google Assistant properly.

# begin build properties

# autogenerated by buildinfo.sh

ro.build.id=NMF26V

ro.build.display.id=lineage_titan-userdebug 7.1.1 NMF26V 399d12a5d9

ro.build.version.incremental=399d12a5d9

ro.build.version.sdk=25

ro.build.version.preview_sdk=0

ro.build.version.codename=REL

ro.build.version.all_codenames=REL

ro.build.version.release=7.1.1

ro.build.version.security_patch=2017-01-05

ro.build.version.base_os=

ro.build.date=Tue Jan 31 23:31:20 PST 2017

ro.build.date.utc=1485934280

ro.build.type=userdebug

ro.build.user=jenkins

ro.build.host=phenom.zifnab.net

ro.build.tags=release-keys

ro.build.flavor=lineage_titan-userdebug

ro.product.brand=motorola

ro.product.name=lineage_titan

ro.product.board=MSM8226

# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,

# use ro.product.cpu.abilist instead.

ro.product.cpu.abi=armeabi-v7a

ro.product.cpu.abi2=armeabi

ro.product.cpu.abilist=armeabi-v7a,armeabi

ro.product.cpu.abilist32=armeabi-v7a,armeabi

ro.product.cpu.abilist64=

ro.product.manufacturer=motorola

ro.product.locale=en-US

ro.wifi.channels=

ro.board.platform=msm8226

ro.build.characteristics=default

ro.cm.device=Pixel XL

# end build

Update: I have further changed the manufacturer and brand to Google and the product to Pixel XL, but it still had no effect.