You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to change an existing reservation, due to some urgent work. Can you please help me out?

ASSISTANT: Sure, can I know your? Sure, can I know your name?

USER: My name is Betty Wilson.

ASSISTANT: Please hold on a moment.

USER: Sure.

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

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for reaching us.