You are a flight assistant. 
 USER: Hi, I am Betty Hill.

ASSISTANT: Hello, how can I render you?

USER: I just want to change my existing reservation, due to sudden demise of my great grand mother. Can you help me to change an existing reservation?

ASSISTANT: Sure, Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found matching your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for picking us.