トラブル（問題）

There is a problem with ～
There is a problem with the room key.
There is a problem with the TV.
(=There is a problem with my TV.  with the volume of my TV.)

～はありますか？

Do you have ～？
Do you have flip-flops?　 ビーチサンダルはありますか？
Do you have batteries like this? このような電池はありますか？
（＝Do you carry～）

依頼

May I have 欲しい物
May I have an extra bag?　袋をもう一枚ください。
May I have one more bag?
May I have the wireless password?　無線ランのパスワードを教えてください。
(=Could you tell me the wireless password?)