You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Ok, I am here to help you with that. May I know your good name?

USER: Brenda Wilson is my name.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there are is no reservation found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.