You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to do some changes in my existing reservation, can you help me for that?

ASSISTANT: Sure, may I know your good name?

USER: My name is Amy Lewis.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome, have a nice day.