You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I am Brian Gonzalez. Please assist me to change an existing reservation due to sudden demise of my great grand mother.

ASSISTANT: Sure. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.