You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Moore here.

ASSISTANT: How may I assist you at this moment?

USER: Due to inconvenience of my dates, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I will glad to help you with that as per your convenience to serve you better as per my policy.

USER: Ok.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: I will wait.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us, have a great day.