You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Robert Allen, I want to change my reservation as my plan to meet mu cousin is postponed. Can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation made on your name. Thank you for reaching us.

USER: Thank you for information.