You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, May I know your name?

USER: I am Nancy Turner.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.