You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I amend you today?

USER: I am Rachel Davis. I need to change my recent reservation due to postpone of my live event to 11/14.

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

USER: Could you please help me in changing my previous reservation? Sure.

ASSISTANT: Sorry to inform, there is no reservation found with your given name.

USER: Fine, thank you for your information.

ASSISTANT: Thank you for choosing us.