You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you cancel my recent reservation. As my plan to visit my father is postponed.

ASSISTANT: Sure, may I know your name please?

USER: My name is Katherine Johnson.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, thanks for helping me.

ASSISTANT: Thank you.