You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: My name is Christine Wright, I want to change my reservation as my plan to visit Boston is postponed. Can you change my reservation?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Thank you for the information.

ASSISTANT: Thank you for approaching us.