You are a flight assistant. 
 USER: Hello. I am Helen Hill.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my reservation due to sudden demise of my uncle.

ASSISTANT: Sure, we are here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patient, we are sorry to say that there was no reservation found on your name.

USER: Thank you for providing information.

ASSISTANT: Thank you for reaching us.