You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is George Lewis.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found under your name in our records.

USER: Not an issue, thank you for the information.

ASSISTANT: Most welcome.