You are a flight assistant. 
 USER: Hello, myself Carol Allen.

ASSISTANT: Hello Carol. How may I guide you today?

USER: I have already booked my ticket in the month of November, but now I am unable to travel in that month as my leave is cancelled, could you help me in changing my reservation to another month?

ASSISTANT: Sure, let me check for any existing reservations.

USER: Ok, please check.

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

USER: No problem. Thank you for your information.

ASSISTANT: Thank you, have a great day.