You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

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

ASSISTANT: How may I oblige you? Sure, I will help you. Can you please provide me your name?

USER: Karen walker is my name.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: That's ok, no issues. Thank you for informing.

ASSISTANT: Thank you for reaching us.