You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffery Lee.

ASSISTANT: How may I help you?

USER: I want to change my reservation due to sudden demise of my grandfather. Can you help me?

ASSISTANT: I am happy to help you, please be on hold I will let you know the current status of your reservation. We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thanks for choosing us, have a nice day.