Therefore, to say hello, goodbye, and thank you in "Siberian", you need to specify the particular language you are interested in.
Here are some examples:
Russian:
* Hello: Здравствуйте (Zdravstvuyte) - formal
* Goodbye: До свидания (Do svidaniya) - formal
* Thank you: Спасибо (Spasibo)
Yakut:
* Hello: Эһиги эҕэрдэ (Esigi egerde)
* Goodbye: Кэлэ сылдьыбыт киһи (Kele syldybyit kisi)
* Thank you: Махтал (Maxtal)
Altai:
* Hello: Салем (Salem)
* Goodbye: Кош бол! (Kosh bol!)
* Thank you: Рахмат (Rahmat)
Please provide the specific language you are interested in, and I can give you the correct phrases.