Answer: thanks a lot / do1 ze6/ ? or ? 唔該/ m4 goi1/

Well, you can also add "晒" /saai3/ after "多谢" to strengthen the tone.

Note: The words are followed by Cantonese pinyin, and the numbers indicate the tones

Cantonese, also known as Cantonese and Guangfu, commonly known as Baihua, and known overseas as Tanghua, is a tonal language of the Sino-Tibetan family of Chinese, one of the seven major dialects of China, and the native language of the Han Chinese people of Guangfu.

The name Cantonese originates from the ancient Chinese state of Nan Yue (南越國), a general term for the south of the Lingnan region of China (Nan Yue Guo (南粤国)) in the Han Shu (汉书). It is also known as "Baihua" or "Cantonese", and in Chinatown in the Americas it is known as "Tanghua".

The two common names "Guangfu dialect" and "provincial dialect" specifically refer to the Cantonese spoken in the old Guangzhou Prefecture area (present-day Guangzhou and the surrounding Nanfanshun area), Hong Kong, Macao, Wuzhou, and Hezhou, and are smaller in scope than the concept of "vernacular". The concept of "vernacular" is smaller than that of "Cantonese", which is generally referred to as "Cantonese".

Expanded link: Baidu Encyclopedia: Cantonese (a language of the Sino-Tibetan family)