Answer by Professional Japanese Teacher
Koohii ni shimasuka, koocha ni shimasuka.
Would you like to have coffee or tea?
Koohii to koocha ga gozaimasuga, dochirani nasaimasuka?
We have coffee and tea, which one would you like?
Chikin ni shimasuka, sakana ni shimasuka?
Would you like to have chicken or fish?
Chikin to sakana ga gozaimasuga, dochirani nasaimasuka?
We have chicken and fish, which one would you like?
It’s a very long expression. If you check “or” in a dictionary, the word “か ka” or “それとも soretomo” would probably appear but because you are working in the service industry, it will sound very rude if you simply use what you found in a dictionary. The above phrases are a bit long, but I think you will use them quite often. Do practise and become fluent in it.