You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Michael Thomas.

ASSISTANT: Ok.

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

ASSISTANT: Sure, please wait for a while. Sorry Michael, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your help.

ASSISTANT: You are welcome.