You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Carol Williams here.

ASSISTANT: Yes.

USER: I want to cancel my recent reservation due to my grand father health issue. Will you help me ?

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

USER: It's ok. Thank you for checking.

ASSISTANT: Thank you and have a nice day.