This is survival Thai 101
Hello = Sawaddee
If you want to sound extra polite, you can do that by adding a modifier at the end of each phrase or sentence. If you are a man, say "krub". And if you are a woman, say "Ka".
For example, to say hello in a very polite way, a male speaker can say "Sawaddee krub" and a female speaker can say "Sawaddee ka".
The word "sawaddee" is like "Ciao" in Italian. use it to say both hello and goodbye.
How are you? = Sabai dee mai
I'm fine. = Sabai dee
I'm not feeling well. = Chan mai sabai
Thank you = Kob kun ("u" in "kun" is pronounced "oo" as in "foot")
I'm sorry. = Kaw tode
Never mind./You're welcome. = Mai pen rai
My name is.... = Chan cheu...
What's your name? = Kun cheu arai
Nice to meet you. = Yin dee tee dai rue juk
Yes = Chai
No = Mai chai
Note: it never hurts to smile. and say ma pen rai.