機会があり次第、そうしよう。の英語

I will do it on the first occasion.

I will do it at the first opportunity.

as occasion serves

at the earliest opportunity

as occasion offers

There is always a next time.

There is always another time.

There's always a next time.

being if all goes well

Don't throw away your chance.

as occasion offers

take the first opportunity of doing…

till a good chance offers itself

I will have it out with him whenever I have a chance.

If I get time, I will.

If I have time, I'll do it.

We ask for your kind support at that time.

Take the first opportunity that offers.

Let's go there again if we have the opportunity.

Please try it if you have the chance.

take [seize] an opportunity

Do this at your leisure.

I will take occasion to speak to him.

If by some chance...

If we get another opportunity let's go to hang out together or something.

If I have time, I'll do it.

I hope you will use our service again.

You can do it at your leisure.

May I take a rain check?

to be able to wait for an opportunity