You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Nancy Wilson.

ASSISTANT:  Nice to meet you Nancy Wilson.

USER: As my brother's marriage got postponed, I would like to change my reservation.

ASSISTANT: Oh! ok, please wait, I will check it and let you know the details of your previous flight.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no reservation found with your name to change.

USER: It's ok. Thank you for your information.

ASSISTANT: My pleasure.