Let sentences end in a preposition

If the more natural sounding way of asking a question or providing information has you ending a sentence with a preposition, so be it. Do not twist sentences into weird sounding phraseologies just to satisfy some English grammar rule that, in any case, is almost always disregarded in spoken speech.

Here is a not-so-natural sounding prompt:

System: From where will you be leaving?

Here is a more natural sounding prompt:

System: Where are you leaving from?