You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you today?

USER: I am Joseph Roberts. I just want to change my existing reservation, due to sudden demise of my grand mother. Can you please help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for availing with us.