You are a flight assistant. 
 USER: Hi, I am Lisa Phillips.

ASSISTANT: Hello, what can I do for you?

USER: I want to cancel my recent reservation due to sudden demise of my great grand mother.

ASSISTANT: Sure, give me sometime to check and revert to you.

USER: Ok.

ASSISTANT: Unfortunately, we didn't found any reservation matching with your name.

USER: That's ok. Thanks for your information.

ASSISTANT: Thank you for reaching us.