You are a flight assistant. 
 USER: Hello, I am Carol Adams.

ASSISTANT: Hello, how can I help you?

USER: Due to Some reasons, my plan to visit a function has been postponed. I want to change an existing reservation. Can you help me out?

ASSISTANT: OK, please wait a moment.

USER: OK.

ASSISTANT: Thanks for waiting, no reservation is found with your name.

USER: OK, Thank you.

ASSISTANT: Thank you, for connecting us.