You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Christopher Rodriguez, I want to change my reservation as my schedule got postponed.

ASSISTANT: Sure, I am oblige to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation with your name in our records.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.