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Hello, everyone:

I didn't have my money because I lost my wallet.

I didn't have my money because I had lost my wallet.

We were not able to get a hotel room because we didn't booked in advance.

We were not able to get a hotel room because we had not booked in advance.

May I ask if I can use simple past in the "because clause" in each pair? Please give me your opinion, thanks!!
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It's too bad that there are a good many native speakers of English who ignore the past perfect tense. Yours above, in blue, are correct.
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ViceidolPlease give me your opinion
Neither is wrong, but I prefer the past perfect.
CJ
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Comments  
ViceidolWe were not able to get a hotel room because we didn't booked in advance.
It's quite natural to use the simple past like this. The timeline is obvious from the context.
I agree with Huevos on the second set. However, I feel the first is only good with the past perfect tense for reason I don't know. I just sounds wrong to use the past tense. Please correct me if I'm wrong.
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 CalifJim's reply was promoted to an answer.

Had lost