You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please change my reservation as my brother's engagement got post poned.

ASSISTANT: Ok. Sure, may I know your good name for further process?

USER: I am Nancy Taylor.

ASSISTANT: No reservation found on your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.