You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: My final exam dates are postponed, can you please help me for changing the existing reservation?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: Could you please provide your name to check your previous reservation status?

USER: Sure, my previous reservation is on the name of John Lee.

ASSISTANT: Please wait for a while, I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any reservation against your name.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thank you for your information.