Aisatsu are the greetings and salutations at the beginning and end of class.
Teishu (host) to sensei (teacher):
Sensei, usucha hirademae no o-keiko onegai itashimasu.
Sensei, please be so kind as to teach me the "hira" procedure for making thin tea.
Teishu to o-kyaku-sama (guests, singular or plural):
O-kyaku-sama, yoroshiku onegai itashimasu.
Difficult to translate, as yoroshiku onegaishimasu is a conventional greeting, though it means something like "please take care of me." Japanese people say it to each other upon first meeting. In a tea ceremony, the host and guests say it to each other, reflecting their mutual desire to have a favorable experience.
Shokyaku (first guest) to sensei:
Sensei, kyaku no o-keiko onegai itashimasu.
Sensei, please teach me the guest role.
Shokyaku to shoban (second guest):
Go-isho-ni, yoroshiku onegai itashimasu.
Let’s enjoy tea together.
The 'go' in go-isho-ni is identical to the 'o' honorific in words like o-temae. It is generally used instead of 'o' in words of Chinese origin.
Teishu to sensei:
Sensei, usucha hirademae no o-keiko arigatou gozaimashita.
Teishu to o-kyaku-sama:
O-kyaku-sama, arigatou gozaimashita.
Shokyaku to sensei:
Sensei, kyaku no o-keiko arigatou gozaimashita.
Shokyaku to shoban:
Arigatou gozaimashita.