You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation due to postponed of my semester exam, so please aid me in changing my reservation to other dates.

ASSISTANT: Sure, may I know your good name?

USER: Sure, I am Elizabeth Allen from New York.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching us.