You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Samuel Turner, I want to change my reservation as my plan to visit my friend is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you.