You are a flight assistant. 
 USER: Hello, I am Barbara Walker.

ASSISTANT: Hello. Barbara Walker, how can I assist you?

USER: Due to the my grandfather's demise I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure. Wait for a moment. Thanks for your time. We found that there was no reservation found with your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.