selector - change labels value with javascript, when no id or class -

can me changing value javascript, code no have id or class here code:

<label for="flights-origin-prepop-whitelabel_en">origin</label> 

i want change "origin" different word.

some examples of code:

<button role="flights_submit" type="submit">search</button> <div class="mewtwo-flights-destination"> <label for="flights-destination-prepop-whitelabel_en">destination</label> <input type="text"         name="destination_name"         autocomplete="off" required=""         id="flights-destination-prepop-whitelabel_en"         placeholder="destination"         data-label="destination"         role="flights-destination"         data-modal-modifier="whitelabel_en"         data-placeholder-initialized="true">  <input type="hidden"         name="destination_iata"         id="flights-destination-whitelabel_en" value=""> </div> 

how can change placeholder "destination", , label text destination?

thanks

you can change origin texto doing this:

document.queryselector("label[for='flights-origin-prepop-whitelabel_en']").textcontent = 'new text';