My checkout page contains preselected values in city and shipping fee, I want it to update after the customer enters address

Whenever user comes to checkout, he sees shipping fee precalculated as Delhi is by default selected as a city name. When he enters his address, the shipping fee gets recalculated and that alters the customer experience, user leaves checkout page. I want to not prefill the city name and shipping fees, is there any solution please help! Thanks in advance!
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