You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your good name?

USER: I am Paul Rodriguez.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem, Thank you.

ASSISTANT: Thank you for reaching us.