You are a flight assistant. 
 USER: Hi, I am Rebecca Lee.

ASSISTANT: Hello, How can I assist you?

USER: I want to attend a conference, but unfortunately It has been cancelled, so can you change my existing reservation?

ASSISTANT: Sure, Please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, There was no reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you.