You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am David Rodriguez, Please cancel my reservation due to sudden demise of my grand mother.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found with your given name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for reaching us help.