You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Joseph Wright from Atlanta. I have reserved a ticket in last month to spend a my vacation holidays with my friends but suddenly leaves got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Oh! It may not be booked properly due to some technical issues.

ASSISTANT: You are welcome, have a nice day.

USER: Anyway, thank you for your time.