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

ASSISTANT: Hello, how can I help you now?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform that, there is no active reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thanks for choosing us, have a great day.