You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Due to the sudden demise of my granddad I want to change my existing reservation.

ASSISTANT: Sure, may I know your name for change in your reservation?

USER: Sure, I have a existing reservation with name Brian Wilson.

ASSISTANT: Please wait a moment, let me check with the details.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name with our service.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching our service.

USER: Thank  you for your assistance.