You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I have already booked my ticket to Boston but due to an emergency my trip got postponed.

ASSISTANT: Can I know your name?

USER: My name is Joseph Davis.

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

USER: Ok, take your time.

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

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you, have a good day.