You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need some changes in my previous reservation so please help me with changing my reservation.

ASSISTANT: Sure, I need to know your name to check your reservation status.

USER: Sure, myself Angela Rodriguez.

ASSISTANT: Please wait for a moment. Sorry Angela, no reservation is found.

USER: Oh! May be booking is not done properly.

ASSISTANT: Thank you for contacting us.

USER: Anyway, thank you for your time.