Mexico City to Narita thru Tijuana. At check-in I requested for check-thru for my baggage but the man in the counter said it is not possible. I got alarmed when my other colleagues (we were in a group reservation) baggage were checked-thru. I had to recall from baggage and made to baggage drop for check-thru to Manila via Narita. Mexico City to Tijuana leg we were assigned a seat number - 14E which did not exist. So they found us seats on row 22. When we reached Tijuana we stayed on board and we asked if we needed to change seats as we were given boarding pass with different seat assignments. Again I was assigned seat 12A which still does not exist in the plane. We were made to sit in other seats and we had to bring our blankets and earphones because they do not issue fresh ones. We had connecting flights in Narita for our trip to Manila. When we got to Manila our baggage did not come with us. For 2 days we tracked our delayed baggage and learned they were not loaded apparently when we left Mexico.