According to Pegasus Airlines' General Rules, if a passenger fails to board a flight as indicated on their ticket, they forfeit all rights and claims to any remaining flights listed on that ticket.
Therefore, missing a flight can result in the cancellation of subsequent segments in your itinerary. To address this situation, it's crucial to contact Pegasus Airlines' customer service immediately to explore possible options, such as rebooking or reinstating canceled segments.
Additionally, reviewing your travel insurance policy, if applicable, is advisable to determine if it covers missed flights and any associated expenses.