You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Kevin Phillips. I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed.Will you help me in changing my reservation?

ASSISTANT: Sure, please allow me a moment.

USER: Thank you for accepting my request.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome, have a great day.