You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Raymond Allen, I need to modify my reservation as my schedule got postponed.

ASSISTANT: Sure, I will help you with that.

USER: Thank you for the help.

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

USER: Ok.

ASSISTANT: Sorry Raymond Allen, no reservation has found under your name to change.

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

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