YOU SAID:

I don't think there is, but I promised my boss I would ask.

INTO JAPANESE

あるとは思いませんが、上司に尋ねると約束しました。

BACK INTO ENGLISH

I don't think there is, but I promised to ask my boss.

INTO JAPANESE

ないと思いますが、上司に聞くと約束しました。

BACK INTO ENGLISH

I don't think so, but I promised to ask my boss.

INTO JAPANESE

そうは思いませんが、上司に聞くと約束しました。

BACK INTO ENGLISH

I don't think so, but I promised to ask my boss.