You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Lisa Mitchell, I want to cancel my reservation as my plan to visit my friend at Oakland is postponed. Can you help me to cancel my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for opting us.