You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change an existing reservation.

ASSISTANT: OK, I will help you. May I know your good name?

USER: My good name is Samantha Walker.

ASSISTANT: Please wait, I will check and get back to you.

USER: OK, I will wait.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: OK, not a problem. Thank you.

ASSISTANT: Thanks to connecting with us, have a nice day.