You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning. How may I guide you?

USER: I have already booked a ticket with my name.I want to change my dates of travel as my business trip got postponed.

ASSISTANT: Sure, can I know your name?

USER: My name is Timothy Turner.

ASSISTANT: Sure, please hold on for a moment, let me check.

USER: Sure.

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 valuable time.