You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have reserved a ticket last month to enjoy my vacation holidays but suddenly my leaves got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you to change your reservation. Could please provide me your name?

USER: Thank you. Myself Margaret Davis.

ASSISTANT: Please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: Welcome, have a nice day.