Dears Mrs., Ms., Mr., In late July 2017, I booked a flight from Sofia (Bulgaria) to Paris (France) with a stop in Berlin (Germany). After a flight confirmation and online check in procedure, I received my ticket per mail. As I'm not able to join the ticket file here, I could send it per demand. When I made my reservation, I booked two flight operated by Air Berlin, even if the first flight was with Bulgaria Air's airplane. So once we arrived on the Berlin's track it was 7:45 CET. We count some 10 minutes also to be chartered till the out gate. So in 7:55 CET we were in front of the passport control tail. After a kind request addressed to 2 airport employee, they refused to me and 6 other persons supposed to take the same plane for Paris, to pass faster the passport control. So once I pass the passport control it was already 8:25 and it takes some 2 minutes to find the out gate C67- C68. Once me and some other passengers became in front of the out gate door, an Air Berlin company employee charged with the check in on the plane told us that it's too late and we aren't able to be let in for this flight even if the plane was still on the track. Then we were asked to find the AHS Service on the same terminal. After a discussion with 3 different employee of AHS Services, they explained to us that if me missed the flight it's our problem and they are not able to made anything to help us. They gave us a phone number of Bulgaria Air’s call center and then tried to kick us asap, telling that they couldn't help us anymore. We tried to join Bulgaria Air even if it was only Air Berlin that was supposed to rebook our flight, cause the two flight was operated from your company. So after 4 hours spend on the airport, without clear explanation from Air Berlin's employee and without having other choice, we bought a new Air Berlin’s ticket from Berlin to Paris. (with relevant number AB8296). I could send you an invoice and boarding card that could confirm you that I bought the ticket for the price of 295.16€. With this mail, I'm kindly asking you to reimburse us for the second flight ticket, which price’s 295.16 €. Please let me know if you need any ticket copy, that I could send you over a mail.Thank you and I'm waiting for your fast return on this topic. Best regards, Beatris Shahinyan