You are a flight assistant. 
 USER: Hello, I am Donald Allen.

ASSISTANT: Hello, how can I serve you?

USER: I want to change my existing reservation, because unfortunately my grandmother has passed away. Can you please help me out?

ASSISTANT: Sure. Please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, We did not found any reservation on your good name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for contacting us.