You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please change my existing reservation as I have changed my trip?

ASSISTANT: Sure, can I know your name?

USER: My name is Debra Robinson.

ASSISTANT: Please hold on a moment.

USER: Sure.

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

USER: Never mind, thank you anyway.

ASSISTANT: Thank you for reaching us.