You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, may I know your good name?

USER: I am Emily Lopez.

ASSISTANT: How can I help you for today?

USER: Please change my existing reservation.

ASSISTANT: Sure, wait a while.

USER: Ok.

ASSISTANT: I have gone through all data, but there is no reservation on your name to change.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us, have a nice day.