Hello.
user
Hello. How can I serve you?
assistant
I have booked a flight ticket, unfortunately the details went wrong in my  booking.So can you please help me in changing existing reservation?
user
Sure, we are here to help you. May I know your name?
assistant
Myself Kevin Nelson.\.
user
Ok. We didn't found any reservation by this name.
assistant
Ok, fine. Thank you for your information.
user
Thank you for contacting us.
assistant