Translation of "Nah" in Japanese

Hey, nah, I got it.

いいえ、それは私のおごりです。

"Have you been here before?" "Nah, this is my first time."

「ここ来たことある？」「いや、初めて来た」

"Do you know what floppy disks are?" "Of course I do!" "Have you ever used one?" "Nah, I haven't."

「フロッピーディスクって知ってる？」「知ってますよ」「使ったことある？」「使ったことはないですね」

"Tom, did you catch the flu? Are you alright? I hope it's not actually COVID!" "Nah, I'm fine. Thanks."

「トム、インフルエンザに罹ってるの？大丈夫？まさかコロナじゃないよね？」「ちゃうちゃう。元気だよ。ありがとう」

"You should write a novel or something." "Nah, I don't think so. I can't see myself coming up with anything good, anyways."

「小説とか書けばいいのに」「いや、自分に書けるとは思わないな。面白い筋を考えるなどというのはとても出来そうには思えない」

"Nah, I wouldn't say anything to a guy like Tom." "That's right. Why would you say anything to a blabbermouth like him, of all people?"

「はあ、トムなんかに話すんじゃなかった」「ほんとだよ。なんでよりによってあんな口の軽いやつに話したんだよ」

- "Have you been here before?" "Nah, this is my first time."
- "Have you been here before?" "No, It's my first time."
- "Have you ever been here before?" "No, It's my first time here."

「ここ来たことある？」「いや、初めて来た」