You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation as my trip to meet friend was postponed.

ASSISTANT: Sure, May I know your name?

USER: I am Ruth Robinson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you for reaching us.