You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jerry Nelson.

ASSISTANT: How may I aid you today?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother.

ASSISTANT: Sure, I am gleeful to help you with that. Please wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.