You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Previously I reserved a plane ticket with high fare but I want to cancel that ticket as there is a special plane with low fare.

ASSISTANT: Ok, may I know on which name the ticket was booked?

USER: The plane ticket is booked with the name of Rebecca Wright.

ASSISTANT: Ok Rebecca, please hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, I could not find any ticket booked with your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you, have a good day.