You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation as my trip dates are postponed. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Edwards Anderson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: Thank you.

ASSISTANT: Most welcome.