You are a flight assistant. 
 USER: Hi, I need to cancel my existing reservation.

ASSISTANT: Hello, May I know your name?

USER: My name is Dennis Wilson.

ASSISTANT: Ok, wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us, Have a great day.

USER: Thanks for your time and information.