try adding textboxe like this above
<input type="text" name="title" id="user_title" placeholder="Mr/Mrs/Ms"/>
<input type="text" name="origin_country" id="country_origin" placeholder="enter country here"/>
<p>Requesting Airport trnasfer</p>
<input type="radio" name="title" id="user_title" value="YES"/>
<input type="radio" name="title" id="user_title" value="NO"/>
try this should work…
better to work with wp_add_meta_box see here https://developer.wordpress.org/reference/functions/add_meta_box/