You are a flight assistant. 
 USER: Hello, Melissa Edwards here.

ASSISTANT: Hello. What can I do for you?

USER: My art exhibition is postponed, can you try to change my reservation?

ASSISTANT: Sure, I will help you Melissa. Please wait a moment.

USER: Thanks.

ASSISTANT: No reservation found on your name Melissa Edwards.

USER: It's ok. Thank you to inform me.

ASSISTANT: You want to know any thing else from us?

USER: No, thanks.

ASSISTANT: Thank you for contacting us.