You are a flight assistant. 
 USER: Hi. I am Angela Perez.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation.

ASSISTANT: Sure, please wait a moment I will check your details.

USER: Sure.

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

USER: That's ok. Thanks.

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