Booking 2 ways ticket, not onboard 1 way, consider canceling both? [duplicate]

It's hard to explain the situation in title, so here it is:

I'm booking a 2 ways tickets from Singapore to Vietnam (Hanoi). However, i didn't board the trip Sing-Viet. Instead, I purchased another 1 way ticket, from Singapore to Vietnam with different time.

In that case, when I'm back from Vietnam to Singapore, the flight counter said, my tickets is not valid anymore, as i didn't take the 1st board,

Based on International Rules, they said.

So, Is my 2 ways tickets valid?

singapore vietnam

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What does duplicate booking mean?

to promise the same room, seat, ticket, etc. to more than one person or group: The room was double-booked so they had to give us a different one. Making bookings & reservations.

Can you book two tickets on the same flight?

I'm going to give that United representative the benefit of the doubt and assume they were misinformed and not actively trying to mislead a customer. But the answer to the question is no \u2014 it is absolutely not against the law to book two tickets for the same day on the same route.

What happens if you double book a flight?

If you have purchased an airline ticket for the same person on two different sites, you must contact the airline immediately. Then you need to request to cancel one of them. Most airlines will get this done without any financial compensation.

Can I cancel one leg of my flight?

If you are flying within the USA and have no checked baggage to a final destination, then skipping the final leg of a journey is usually fine. There's no penalty for cancelling (as the missed leg is the end of your trip), and you can just leave the flight with hand luggage without any worries.

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Sam Lion, Monstera, Armin Rimoldi, George Milton