내 기억력이 얼마나 좋다고.

A: I seem to recall you promising me dinner.
B: You have me confused with somebody else.
A: That’s very unlikely. 내 기억력이 얼마나 좋다고.
B: Well, you’re in luck. I’ve got time this evening.

A: 나한테 저녁 사준다고 약속한 걸로 기억하는데.
B: 다른 사람하고 착각하는 거겠지.
A: 그럴 가능성은 희박해.My memory is sharp.
B: 너 오늘 운이 좋다. 오늘 저녁 마침 시간이 나거든.

[Additional expressions]
*I seem to recall
– I remember / Something comes to mind about / I have something in my memory about
*you promising me dinner
– you saying that you would treat me to dinner / you offering to buy dinner for me
*You have me confused with somebody else.
– You’re thinking of someone other than me.
*That’s very unlikely.
– I don’t think so. / That’s highly not probable. / I doubt that.
*My memory is sharp.
– I have an excellent memory. / I’ve got the memory of an elephant.
*you’re in luck
– it’s your lucky day / you’ve got some pretty good luck
*I’ve got time this evening.
– I’m free this evening. / I’m not doing anything tonight.