You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid 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, I am here to help you. May I know your good name please?

USER: Charles Turner here.

ASSISTANT: OK. Thank you for providing all necessary details, wait for a while, I will check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us, have a good day.