You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you today?

USER: I am Nancy Edwards, I just want to change my existing reservation.

ASSISTANT: Sure, give me a moment I will check the status and get back to you.

USER: OK.

ASSISTANT: Thank you for waiting, sorry we did not find any reservation with your name.

USER: OK, Thank you for your information.

ASSISTANT: Have a nice day.