If I miss a flight will the airline cancel the remaining flights?

Yes, if you fail to show up for a flight the airline will almost always assume your trip is off and immediately cancel any remaining flights on your itinerary that are included on the same ticket. If you realize you will miss your flight, but wish to use the remaining flights, contact your agent or the airline immediately. In most cases, in order to use the remaining flights the airline will recalculate the cost of the ticket without the missing flight and charge you any difference.