You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Elizabeth Campbell, want to alter my recent reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, please hold on for a moment.

USER: Ok.

ASSISTANT: I am sorry, there are no reservations with your name. Thank you.

USER: It's ok, thank you.