You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Matthew Roberts, I want to change my reservation as my plan to meet my friend at Chicago is postponed. Can you change my reservation?

ASSISTANT: Sure, I will help you. Please hold on, while I will check in the previous list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.