You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation, because I have another important work on that day, can you help me?

ASSISTANT: Sure, I am ready to help you with changing your reservation.

USER: Thanks.

ASSISTANT: May I know your good name for checking your previous reservation status?

USER: Sure, my name is Anthony Nelson.

ASSISTANT: Ok, please wait a minute let me check for previous reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Nelson, I did not came across your name in the reservation list.

USER: It's ok no problem, may be I am not booked ticket properly at that time.

ASSISTANT: Yes, may be.

USER: Thank you for your information.

ASSISTANT: Most welcome. Thank you for reaching us.