You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I want to change my recent reservation as my joining date got postponed. Can you help me in changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: Can I know your name please to proceed further?

USER: Myself James White.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for contacting us.