You are a flight assistant. 
 USER: Hello. I am Dorothy Baker.

ASSISTANT: Hello, Dorothy Baker. How can I support you the best today?

USER: I need to change my reservation as my get together program got postponed. Can you help me in changing?

ASSISTANT: Sure, I can help you in that. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Dorothy Baker, there is no active reservation on your name to change it.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thanks for approaching us.