You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please change my reservation as the baby shower program which I want to attend got postponed?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Ok, May I know your name to proceed further?

USER: Sure, my name is Helen Collins.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your given name.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for reaching us.