頼んだら

if (someone) asks, if (someone) asked

→ 頼む
頼ん ask someone to do something + だ Past tense + ら Conditional (if/when)
verb · informal, past tense Rare #33,809
if (someone) asks, if (someone) asked Can also suggest an action in context: “Why don’t you ask?”
JA: 頼んだら、手伝ってくれました。
EN: When I asked, they helped me.
Conjugation of 頼む
Conditional past
頼んだら

「泊まってって」って、頼んだら泊まってくれる?

If I asked you to stay the night, would you?

もう一度頼んだら、彼も気が変わるかもしれない。

If you ask him one more time, he might change his mind.

ルチアニに頼んだら?

Why don't you ask Luciani?

— 預言者 (2009)

彼に両替を頼んだらしてくれた。

I asked him to exchange the money, and he did.

チャウさんも頼んだら?

Why don't you ask Chau too?

— 花様年華 (2000)