You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Emily Anderson. I would like to change my existing reservation. Could you please help me out?

ASSISTANT: Please wait a while.

USER: Sure, please take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us. Have a nice day.