You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I am Michael Lee. I need your help in changing my reservation. Can you help me with changing?

ASSISTANT: Sure, that is what I am here. Just wait for a minute.

USER: Sure.

ASSISTANT: Sorry there is no active reservation found on your name to change it.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for communicating us, have a nice day.