How to say "Ok, then I take X" after your first choice is not available


Imagine you are in a restaurant and you want to order food, you choose your
dish but the waiter says that it is not available today.

In English I would now probably say something like

> Ok, then I take curry

What is the natural way of saying this in Japanese? I'm asking about the "Ok,
then" part.

As of now, I would probably just say

> Hmm えとー カレーをおねがいします.




For casual, which is acceptable as a client I would go with

> じゃあ、カレーにします。

If you want to be more polite then

> それなら、カレーにします。

じゃあ means : then; well; so; well then  
それなら means : if that's the case




For casual, which is acceptable as a client I would go with

> じゃあ、カレーにします。

If you want to be more polite then

> それなら、カレーにします。

じゃあ means : then; well; so; well then  
それなら means : if that's the case

