You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: Nicole Johnson here. I just want to change my existing reservation, due to sudden demise of my grand mother.

ASSISTANT: Sure, I am happy to help you with that. Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Nicole Johnson, no reservation has found under your name to change.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.