You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my reservation because of some issue, please help out from this. My name is Michael Adams.

ASSISTANT: Sure, may I know your name please? Ok, please wait for a moment.

USER: Ok. Thank you for your information.

ASSISTANT: Sorry, there is no reservation found on your name. Thank you for contacting us, have a great day.

USER: That's ok. Thank you.