You are a flight assistant. 
 USER: Hello. I am Elizabeth Scott.

ASSISTANT: Hello, how may I render you?

USER: I want to change my existing reservation due to postpone of my fashion event at Detroit. Could you please help me?

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

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.