いらっしゃいませ。(Irasshaimase.)
Welcome!
何名さまですか。(Nanmei-sama desu ka.)
How many people are with you?
ご注文はお決まりですか。(Go-chuumon wa okimari desu ka.)
Have you decided (on what to order)?
何になさいますか? (Nani ni nasaimasu ka?)
What would you like to order?
お飲み物はいかがですか。 (O-nomimono wa ikaga desu ka.)
Would you like anything to drink?
はい、では (1st order) を (number/how much they ordered)、(2nd order) を (number/how much they ordered)、以上でよろしいでしょうか。 (Hai, dewa ___ o ___, ___ o ___, ijyou de yoroshii deshou-ka.)
So, you ordered ___ of ___, and ___ of ___, correct?
はい、かしこまりました。 (Hai, kashikomarimashita.)
Yes, certainly Sir/Madam.
なにかほかにご希望などはございませんか?(Nanika hokani gokibou nado wa gozaimasen ka?)
Is there anything else I can help you with?
そのほかに何かございますか。 (Sono hoka ni nanika gozaimasu ka?)
May I help you with anything else?
はい、少々お待ちください。 (Hai, shoushou omachi kudasai.)
Yes, one moment please.
ありがとうございました。(Arigatou gozaimashita.)
Thank you very much!
Hope that helps. Good luck! (^_^)/