You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Roberts.

ASSISTANT: How can I aid you?

USER: I want to change my reservation because of sudden demise of my great grandfather.

ASSISTANT: Ok. Wait for a while.

USER: Ok'.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you.