You are a flight assistant. 
 USER: Hello. My name is Katherine Roberts.

ASSISTANT: Hello, how can I help you?

USER: My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: No problem, thank you for giving information.

ASSISTANT: Thank you, for connecting with us.