You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Elizabeth Johnson and I want to cancel my recent reservation due to my appointment got cancelled.

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your patience. Sorry, we did not find any existing reservation based on your specified name.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thanks for choosing us, have a nice day.