You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Nicholas Evans, want to alter my recent reservation due to some changes in my plan. Please help me out with that.

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Thank you.

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

USER: Sure. It's ok, thank you for your help.

ASSISTANT: Thank you for contacting our agency.

USER: Most welcome.