You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: I am Sarah Brown, I want to cancel my recent reservation as my interview got postponed.

ASSISTANT: Sure, I am here to help you. Please wait a while.

USER: Ok.

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: No problem, thank you for the response.

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