You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My business meeting has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, can I know your good name?

USER: My name is Elizabeth Lewis.

ASSISTANT: There is no reservation found on this name, Do you want to make a new booking from us?

USER: Thank you for your information. No, I don't want to book.

ASSISTANT: Ok Lewis, thank you for reaching us.