You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Charles Edwards. I would like to cancel my existing flight ticket which has been booked earlier this week as my meeting has been cancelled.

ASSISTANT: Ok, please hold on a moment.

USER: Ok, please take your possible time.

ASSISTANT: Thanks for your response, there is no reservation existed with your name to cancel it.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Welcome, have a nice day.