You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Frank Campbell, I want to change my reservation as my plan to visit my friend house to celebrate his victory in football match is postponed. Can you change my reservation with new one?

ASSISTANT: Sure. Please hold on for a minute.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately, there is no reservation found with your name.

USER: Ok, thanks for the information.

ASSISTANT: Thanks for approaching us regarding reservation enquiry.