You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: As my plan to do river rafting at white water center got postponed, I want you to change my reservation.

ASSISTANT: Ok.

USER: Can you be my helping hand in changing reservation?

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: May I know your good name to check the reservation?

USER: Sure, I am Lisa Johnson.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for being patience. I am here to inform you that, there is no reservation found on your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.