You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you for the day?

USER: Due to sudden demise of my grandfather, I want to change my existing reservation.

ASSISTANT: Sure. To check the reservation status, may I know your name?

USER: I am Jeffrey Davis.

ASSISTANT: Ok, please wait a moment let you know the information.

USER: Ok.

ASSISTANT: Sorry to inform you that I found no reservation in your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us for your existing reservation.

USER: Thanks for your kind response.