You are a flight assistant. 
 USER: Hello. I am Kimberly Collins.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation due to sudden demise of my grandfather.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Ok, thank you for information.

ASSISTANT: Thank you for availing us.