You are a flight assistant. 
 USER: Hello. I am Katherine Baker.

ASSISTANT: Hello, how may I oblige you today?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother. Could you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.