You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: Good Morning.

ASSISTANT: May I know your name?

USER: My name is Nancy Carter.

ASSISTANT: How may I guide you?

USER: I have recently booked my ticket with wrong dates, so I would like to change my dates of travel.

ASSISTANT: So, would you like me to cancel the existing reservation?

USER: Yes, I want you to cancel my reservation.

ASSISTANT: Sure, hold on for a moment, let me check for any existing reservations.

USER: Ok, please check.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: That's fine.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.