I would like to change message
"Sorry, no quotes are available for this order at this time"
In which file, i can change? Can it will be manageable by Admin?
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You can change this message from CSV file.
Below is the location and name of csv file
vendor/magento/module-checkout/i18n - en_US.csv
Override it in your custom module or theme and replace your message with default.
Also it is not manageable from Admin.
You can use csv(translation) file to change it as it can not be managed from admin