You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER:  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 the reservation?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: I am Joshua Brown.

ASSISTANT: Give me a minute.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.