I have problem in importing data from other sources

bookings_df <- read_csv("hotel_bookings.csv")

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We really will need more information. See
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We need more information to diagnose this. Could you please reply with your error message?

Also run

file.exists("hotel_bookings.csv")

If the answer is FALSE, then run

list.files(pattern = "hotel_bookings.csv", recursive = TRUE)

Is your hotel_bookings.csv file in the output? If it is, how is it written?

You should never ask for help with a problem without saying what the problem is; learn to recognise error messages and try to understand them; the forum can help you do so.
Best guess - Either your csv is not present, or is not a valid csv, or you forgot to load readr package (or tidyverse (which contains readr))