You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I have booked a flight ticket, unfortunately the details went wrong in my  booking.So can you please help me in changing existing reservation?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Myself Kevin Nelson.\.

ASSISTANT: Ok. We didn't found any reservation by this name.

USER: Ok, fine. Thank you for your information.

ASSISTANT: Thank you for contacting us.