You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am John Wilson, I wan to change my reservation as my plan to visit my parents is postponed due to bad weather. Can you help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.