You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: Actually my college fest dates are got changed , so that I want change my existing reservation. Can you help me?

ASSISTANT: Sure, I am ready to help you with that.

USER: Thank you.

ASSISTANT: Please let me know your good name to check your reservation status.

USER: Yes, I am Shirley Scott.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Shirley Scott, no reservation has found under your name to change your dates in reservation.

USER: Oh! It may not be booked properly due to server issues while booking. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.