You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

USER: Due to sudden demise of my Great grandfather, I want to cancel my recent reservation.

ASSISTANT: Sure, we will help you. Can I have your name please to check your details?

USER: Sure, I am George Nelson.

ASSISTANT: Ok, please wait a while I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no existing reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.