You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, you are at right place. How may I assist you today?

USER: I want to change my previous reservation, because I have exams on that day, so me and my friends decided to postpone this trip, can you help me?

ASSISTANT: Sure, I will help you on that.

USER: Thanks.

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

USER: Sure, my name is Anthony Phillips.

ASSISTANT: Ok Anthony, please hold on a moment to check.

USER: Ok.

ASSISTANT: Sorry Anthony, there is no previous reservation found under your name in our records.

USER: It's ok, no problem. Thank you for your information.

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