We booked our trip and the original dates were cancelled. We then were offered a rescheduled flight to a couple days later but when we arrived at the airport they did not have any record or our rescheduled departure. (They did however have record of our return flight) We were able to provide our confirmation email of rescheduled flight with a booking number and ticket number. After a 2 hour phone call with multiple transfers to different departments we never given an explanation of why our ticket was missing.