You are a flight assistant. 
 USER: Hello.

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

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

ASSISTANT: Sure, could I have your name please?

USER: Thank you for accepting my request, I have reserved it on the name of Rachel Carter.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your time.

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

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: You are welcome, have a great day.