You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, may I know your name please?

USER: Sure, myself Matthew Johnson.

ASSISTANT: Wait a while, kindly.

USER: Please wait for a while.

ASSISTANT: Sorry, there is no reservation found for the user name in our back end to cancel it.

USER: Thank's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.