the internet doesn't care where you are. But it's always the nearest embassy to you that's responsible for you! That's why you put a flight number in that's leaving the country where you apply for the visa!
you're not lying to them! When I apply for a visa I don't book a flight beforehand. If the visa is granted, then and only then, I book a flight!!! If they're asking for flight details on the application I always fill in a flight number! They would have a lot of work to do if they were checking every applicant with the airline!