You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to change my existing reservation, can you please help me out with that?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Could you send me your name?

USER: Myself Angela Miller.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no active reservation found with your name in our records.

USER: Ok, no problem. Thank you for checking out.

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