You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I amend you?

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

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, Gregory Nelson is my name.

ASSISTANT: Please wait for a while.

USER: Ok, take your own time.

ASSISTANT: Thanks for your valuable time. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's ok, No problem. Thanks for your kind help.

ASSISTANT: Thanks for choosing us.