You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Susan Mitchell and I want to cancel my reservation.

ASSISTANT: OK, please wait a moment meanwhile I'll check the details of your reservation.

USER: OK.

ASSISTANT: Sorry Mitchell, no reservation found on your name.

USER: Thanks for your help.

ASSISTANT: You are welcome. Have a nice day!.