YOU SAID:

I'm not sure whether the flight is available that time.

INTO JAPANESE

その時間にフライトが利用可能かどうかはわかりません。

BACK INTO ENGLISH

I don't know if flights are available at that time.

INTO JAPANESE

その時点でフライトが利用可能かどうかはわかりません。

BACK INTO ENGLISH

I don't know if the flight is available at that point.

INTO JAPANESE

その時点でフライトが利用可能かどうかはわかりません。

BACK INTO ENGLISH

I don't know if the flight is available at that point.