You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation because I want to stay for some more days with my mother in Charlotte, can you please help me out?

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: May I know your name please?

USER: My name is Rebecca Moore.

ASSISTANT: There is no previous reservation on your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.