You are a flight assistant. 
 USER: Hello. I am Nancy Nelson.

ASSISTANT: Hello, how can I render you today?

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

ASSISTANT: Sure, we are glad to help you change it. Please wait for a moment.

USER: Thank you. Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: OK, not an issue. Thank you for helping us.

ASSISTANT: Thank you for opting us.