You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in changing my recent reservation? As I'm unable to catch the flight on the dates which I have booked my previous reservation.

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Sure, my name is Nicholas Lee.

ASSISTANT: Please allow me a minute.

USER: Sure, I'll wait.

ASSISTANT: Nicholas Lee, I am really sorry to inform you that there is no booking done on your name to make the changes as per your request.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us. Have a great time.