You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: Myself Nancy Lopez.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

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

USER: No problem, thanks for checking.

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