You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: I am Benjamin. I am Benjamin Lee. Will you help me in changing my reservation as my scheduled dates of travel has been postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, thank you for help.

ASSISTANT: Thanks for opting us.