You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Gregory Philips, I want to change my reservation as my plan to visit my uncle's home is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: Thank you for the information.

ASSISTANT: Thank you for approaching us.